Compressor

A compressor comprising:

• a stack in which multiple electrochemical cells each including an anode, a cathode, and an electrolyte membrane sandwiched therebetween are stacked;
• an end plate located at an end in a stacking direction of the stack;
• and
• a voltage applicator that applies a voltage between the anode and the cathode, wherein
• the compressor causes, by using the voltage applicator to apply the voltage, hydrogen in a hydrogen-containing gas fed to the anode to move to the cathode and produces compressed hydrogen,
• the end plate has a first channel through which a heating medium flows,
• the stack has a second channel extending through the stack and connected to the first channel,
• the first channel has a smaller cross-sectional area than the second channel,
• the first channel includes an annular channel and a transverse passage extending across the annular channel, and
• a heating medium external channel that is disposed outside the stack and through which the heating medium flows is connected to the transverse passage.