Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements on Forms S-3, S-3/A and S-8 of Cooper Cameron Corporation of our reports dated February 23, 2005, with respect to the consolidated financial statements and schedule of Cooper Cameron Corporation, Cooper Cameron Corporation management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of internal control over financial reporting of Cooper Cameron Corporation, incorporated by reference or included in this Annual Report on Form 10-K for the year ended December 31, 2004.

Registration
Statement No.	Purpose
No. 333-26923	Form S-8 Registration Statements pertaining to the Amended and Restated Cooper Cameron Corporation Long-Term
No. 33-95004	Incentive Plan
No. 333-53545
No. 333-37850
No. 333-106224
No. 33-94948	Form S-8 Registration Statement pertaining to the Cooper Cameron Corporation Employee Stock Purchase Plan
No. 33-95002	Form S-8 Registration Statement pertaining to the Cooper Cameron Corporation Retirement Savings Plan
No. 333-57991	Form S-8 Registration Statement pertaining to the Individual Account Retirement Plan for Bargaining Unit Employees at the Cooper Cameron Corporation Buffalo, New York Plant
No. 333-51705	Form S-3 Registration Statement pertaining to the Cooper Cameron Corporation shelf registration of debt securities
No. 333-77641	Form S-8 Registration Statement pertaining to the Cooper Cameron Corporation Savings-Investment Plan for Hourly Employees
No. 333-79787	Form S-8 Registration Statement pertaining to the Cooper Cameron Corporation Second Amended and Restated 1995 Stock Option Plan for Non-Employee Directors
No. 333-46638	Form S-8 Registration Statements pertaining to the Cooper Cameron Corporation Broad Based 2000 Incentive Plan
No. 333-82082
No. 333-61820
No. 333-104755
No. 333-96565	Form S-3 and S-3/A Registration Statements pertaining to the Cooper Cameron Corporation shelf registration of up to $500 million of securities
No. 333-106225	Form S-8 Registration Statement pertaining to the Cooper Cameron Corporation Compensation Deferral Plan, Cooper Cameron Corporation Supplemental Excess Defined Contribution Plan and 2003 Cooper Cameron Corporation Supplemental Excess Defined Contribution Plan
No. 333-116667	Form S-3 and S-3/A Registration Statements pertaining to the Cooper Cameron Corporation 1.50% convertible Senior Debentures due 2024

/s/ Ernst & Young LLP  

ERNST & YOUNG LLP

Houston, Texas

February 23, 2005