-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 BGphbWqughTq9/eVZO7+b/y18K1chCO/B4NX3N8mNYkdu2eisK8ytg3/QAZotQrq
 4ERwgPD3EnzmjQ/Xzi5zQQ==

<SEC-DOCUMENT>0001209191-08-067127.txt : 20081223
<SEC-HEADER>0001209191-08-067127.hdr.sgml : 20081223
<ACCEPTANCE-DATETIME>20081223122116
ACCESSION NUMBER:		0001209191-08-067127
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081218
FILED AS OF DATE:		20081223
DATE AS OF CHANGE:		20081223

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lemley Russ
		CENTRAL INDEX KEY:			0001406298

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12804
		FILM NUMBER:		081266309

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		480-894-6311

	MAIL ADDRESS:	
		STREET 1:		7420 SOUTH KYRENE ROAD SUITE 101
		CITY:			TEMPE
		STATE:			AZ
		ZIP:			85253

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MOBILE MINI INC
		CENTRAL INDEX KEY:			0000911109
		STANDARD INDUSTRIAL CLASSIFICATION:	FABRICATED PLATE WORK (BOILER SHOPS) [3443]
		IRS NUMBER:				860210855
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7420 SOUTH KYRENE ROAD
		STREET 2:		SUITE #101
		CITY:			TEMPE
		STATE:			AZ
		ZIP:			85283
		BUSINESS PHONE:		480-894-6311

	MAIL ADDRESS:	
		STREET 1:		7420 SOUTH KYRENE ROAD
		STREET 2:		SUITE #101
		CITY:			TEMPE
		STATE:			AZ
		ZIP:			85283
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c78668_4x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-12-18</periodOfReport>

    <issuer>
        <issuerCik>0000911109</issuerCik>
        <issuerName>MOBILE MINI INC</issuerName>
        <issuerTradingSymbol>MINI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001406298</rptOwnerCik>
            <rptOwnerName>Lemley Russ</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>7420 SOUTH KYRENE ROAD SUITE 101</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TEMPE</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85283</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock $0.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2008-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>656</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.67</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>41165</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock $0.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2008-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>605</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.67</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>40560</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <ownerSignature>
        <signatureName>/s/ Russ Lemley</signatureName>
        <signatureDate>2008-12-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----