Provided is a copper alloy sheet, with which a heat dissipating component can be given sufficient strength and heat dissipation capacity after being manufactured, in cases where a process of heating to 650 DEG C or more is included as part of a heat dissipating component manufacturing process. The copper alloy sheet for heat dissipating components comprises 0.07 to 0.7 mass% of Fe, 0.2 mass% or less of P, with the ratio of the Fe content [Fe] and the P content [P], or [Fe]/[P], being from 2 to 5, and a remainder of Cu and inevitable impurities. The 0.2% proof stress is no less than 100 Mpa and the conductivity is no less than 50% IACS, subsequent to heating for 30 minutes at 850 DEG C followed by water cooling and then aging treatment. If the copper alloy includes Sn, the contents of Sn and Fe are set to be within the range surrounded by point A (0.1, 0.006), point B (0.5, 0.006), point C (0.05, 1.1), and point D (0.05, 0.05) shown in drawing.