To prevent inflow of the outside air into a pump compartment in a liquid discharge pump.

A pump body has an elastically deformable pump member 12, an inflow side storing hole 16 and outflow side storing hole 17 opened respectively to a pump compartment 15 are formed in a pump body, the inflow side storing part 16 is in communication with an inlet port 18 and the outflow side storing hole 17 is in communication with an outlet port 19. An inflow side check valve 23 to allow a flow heading for the pump compartment 15 from the inlet port 18 and to block a reverse flow is assembled in from the pump compartment 15 side in the inflow side storing hole 16, and an outflow side check valve 24 to allow a flow heading for the outlet port 19 from the pump compartment 15 and to block a reverse flow is assembled in from the pump compartment 15 side in the outflow side storing hole 17.