Discharge apparatus, resin-molded product manufacturing apparatus, and method of manufacturing resin-molded product

A discharge apparatus comprising:

• a cartridge holding portion configured to be capable of holding a cartridge in which liquid resin is accommodated, the cartridge being provided with an outlet from which the liquid resin is discharged;
• a plunger configured to be movable in a first direction and a second direction in the cartridge;
• and
• a sealing member provided to achieve hermeticity between the plunger and the cartridge, wherein
• the discharge apparatus is configured to be capable of discharging the liquid resin from the outlet of the cartridge as a result of movement of the plunger in the first direction,
• the plunger is provided with a flow path that allows flow of gas between a first side and a second side, the first side being a side where the liquid resin is located, the second side being opposite to the first side, and
• the plunger is provided with a check valve that allows flow of gas from the first side toward the second side when the plunger moves in the first direction and allows prevention of flow of gas from the second side toward the first side when the plunger moves in the second direction.