CATHODE, MEMBRANE ELECTRODE ASSEMBLY, AND BATTERY

A cathode, a membrane electrode assembly, and a battery, each has excellent durability. The cathode is a cathode of a battery including an electrolyte membrane, the cathode including: a first layer which contains 0.3 mg/cmor more and 9.0 mg/cmor less of a carbon catalyst; and a second layer which is arranged between the electrolyte membrane and the first layer in the battery, and which contains 0.002 mg/cmor more and 0.190 mg/cmor less of platinum.