WASHINGTON — The House ethics committee on Tuesday dismissed allegations that Representative Vern Buchanan, one of the wealthiest members of Congress, failed to properly disclose some of his financial holdings, but it is continuing to examine a more serious set of accusations against him centering on possible campaign finance violations.

The ethics committee found that Mr. Buchanan, a Florida Republican who leads his party’s nationwide Congressional fund-raising efforts, did not fully disclose all his financial interests in four years’ worth of statements, but that these omissions were not “knowing or willful.” It then closed that portion of its review without taking any further action. Committee leaders added that up to half the disclosure statements they review contain some errors or omissions.

Within minutes of the decision, Mr. Buchanan’s office put out a news release with a large headline that declared, “Buchanan Cleared.” The statement said the congressman “was pleased with the committee’s action but not surprised.”