Item 12(b).
CERTIFICATION UNDER SECTION 906 OF SARBANES-OXLEY ACT OF 2002
Name of Issuer: T. Rowe Price Extended Equity Market Index Fund
In connection with the Report on Form N-CSR for the above named issuer, the undersigned
hereby certifies, to the best of his knowledge, that:
1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the
	Securities Exchange Act of 1934;
2.	The information contained in the Report fairly presents, in all material respects, the
	financial condition and results of operations of the Issuer.
Date: February 21, 2006		/s/James S. Riepe
		James S. Riepe
		Principal Executive Officer
Date: February 21, 2006		/s/ Joseph A. Carrier
		Joseph A. Carrier
		Principal Financial Officer