-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 IlNInVZxKWLrlZ21NdQEnQ==

<SEC-DOCUMENT>0001435775-08-000002.txt : 20080523
<SEC-HEADER>0001435775-08-000002.hdr.sgml : 20080523
<ACCEPTANCE-DATETIME>20080523152936
ACCESSION NUMBER:		0001435775-08-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080521
FILED AS OF DATE:		20080523
DATE AS OF CHANGE:		20080523

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Biodel Inc
		CENTRAL INDEX KEY:			0001322505
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000

	BUSINESS ADDRESS:	
		STREET 1:		100 SAW MILL ROAD
		CITY:			DANBURY
		STATE:			CT
		ZIP:			06810
		BUSINESS PHONE:		203-796-5000

	MAIL ADDRESS:	
		STREET 1:		100 SAW MILL ROAD
		CITY:			DANBURY
		STATE:			CT
		ZIP:			06810

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WEISMAN SCOTT
		CENTRAL INDEX KEY:			0001218154

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33451
		FILM NUMBER:		08858123

	BUSINESS ADDRESS:	
		STREET 1:		20 NEWBURY STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6174250200
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-05-21</periodOfReport>

    <issuer>
        <issuerCik>0001322505</issuerCik>
        <issuerName>Biodel Inc</issuerName>
        <issuerTradingSymbol>BIOD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001218154</rptOwnerCik>
            <rptOwnerName>WEISMAN SCOTT</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BIODEL INC.</rptOwnerStreet1>
            <rptOwnerStreet2>100 SAW MILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>DANBURY</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06810</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 27, 2007.</footnote>
        <footnote id="F2">The amount does not include 107,873 shares held by The 1999 Weisman Family Trust, of which the undersigned and his spouse are trustees.  The filing of this statement shall not be deemed an admission that the undersigned or his spouse is, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of such shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Paul S. Bavier, Attorney-in-fact</signatureName>
        <signatureDate>2008-05-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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