Compressor

A compressor comprising:

• a piston partitioning an inside of a cylinder into a first chamber and a second chamber, the piston being configured to reciprocate;
• a communication passage formed in the piston and establishing communication between the first chamber and the second chamber;
• an opening provided on one end of the communication passage and a one-side surface of the piston on the first chamber side;
• and
• a suction valve configured to open and close the opening,
• wherein the suction valve has a plate-like shape, the suction valve including
• a fixation portion fixed to a center of the one-side surface,
• a closing portion on one radial side with respect to the fixation portion, and
• a spring portion on an opposite radial side with respect to the fixation portion,
• wherein a spring portion facing portion on the one-side surface, which faces the spring portion, is recessed more deeply than a closing portion facing portion, which faces the closing portion,
• wherein the spring portion includes at least two bent portions for reducing a spring constant,
• wherein the spring portion includes a linear portion, first bent portions, second bent portions, and third bent portions,
• wherein the linear portion extends from the fixation portion radially outward,
• wherein the first bent portions are folded back radially inward from one end side of the linear portion in a U-shaped manner,
• wherein the second bent portions are folded back radially outward from opposite end sides of the first bent portions in a U-shaped manner, and
• wherein the third bent portions are curved circumferentially from one end sides of the second bent portions and are connected to the closing portion.