The present invention relates to a catalyst for a solid polymer fuel cell that includes catalyst particles supported on a carbon powder carrier, the catalyst particles containing platinum, cobalt, and manganese. In the catalyst particles of the catalyst, the component ratio of platinum, cobalt, and manganese is Pt:Co:Mn=1:0.25 to 0.28:0.07 to 0.10 in a molar ratio, the average particle size is 3.4 to 5.0 nm, and further, in the particle size distribution of the catalyst particles, the proportion of catalyst particles having a particle size of 3.0 nm or less in the entire catalyst particles is 37% or less on a particle number basis. Then, a fluorine compound having a C—F bond is supported at least on the surface of the catalyst particles. The present invention is, with respect to the above ternary alloy catalyst, an invention particularly effective in improving the durability.