A discharge device for a liquid material containing solid particles, the discharge device comprising: a first reservoir that stores the liquid material containing the solid particles; a first air pressure supply pipe through which pressurized air is supplied to the first reservoir; a metering portion having a metering hole into which the liquid material is filled; a plunger moving back and forth in the metering hole; a nozzle having a discharge port through which the liquid material is discharged; a switching valve having a first position at which the first reservoir and the metering hole are communicated with each other, and a second position at which the metering hole and the nozzle are communicated with each other; a first liquid feed pipe that communicates the first reservoir and the switching valve with each other; a plunger driver that moves the plunger back and forth; and a switching valve driver that shifts the switching valve between the first position and the second position, characterized by the discharge device further comprising: a second reservoir that stores the liquid material; a second air pressure supply pipe through which pressurized air is supplied to the second reservoir; a branch portion provided in an upper portion of the metering hole and having a branch flow path; a second liquid feed pipe that communicates the branch flow path and the second reservoir with each other; and an opening/closing mechanism (4, 34, 39) that establishes or cuts off communication between the second reservoir and the metering hole, wherein the liquid material inside the first reservoir is transferred to the second reservoir by supplying the pressurized air through the first air pressure supply pipe in a state that the switching valve is held at the first position and the opening/closing mechanism (4, 34, 39) is held at an open position, and the liquid material inside the second reservoir is transferred to the first reservoir by supplying the pressurized air through the second air pressure supply pipe in the state that the switching valve is held at the first position and the opening/closing mechanism is held at the open position. a first reservoir that stores the liquid material containing the solid particles; a first air pressure supply pipe through which pressurized air is supplied to the first reservoir; a metering portion having a metering hole into which the liquid material is filled; a plunger moving back and forth in the metering hole; a nozzle having a discharge port through which the liquid material is discharged; a switching valve having a first position at which the first reservoir and the metering hole are communicated with each other, and a second position at which the metering hole and the nozzle are communicated with each other; a first liquid feed pipe that communicates the first reservoir and the switching valve with each other; a plunger driver that moves the plunger back and forth; and a switching valve driver that shifts the switching valve between the first position and the second position, characterized by the discharge device further comprising: a second reservoir that stores the liquid material; a second air pressure supply pipe through which pressurized air is supplied to the second reservoir; a branch portion provided in an upper portion of the metering hole and having a branch flow path; a second liquid feed pipe that communicates the branch flow path and the second reservoir with each other; and an opening/closing mechanism (4, 34, 39) that establishes or cuts off communication between the second reservoir and the metering hole, wherein the liquid material inside the first reservoir is transferred to the second reservoir by supplying the pressurized air through the first air pressure supply pipe in a state that the switching valve is held at the first position and the opening/closing mechanism (4, 34, 39) is held at an open position, and the liquid material inside the second reservoir is transferred to the first reservoir by supplying the pressurized air through the second air pressure supply pipe in the state that the switching valve is held at the first position and the opening/closing mechanism is held at the open position. a second reservoir that stores the liquid material; a second air pressure supply pipe through which pressurized air is supplied to the second reservoir; a branch portion provided in an upper portion of the metering hole and having a branch flow path; a second liquid feed pipe that communicates the branch flow path and the second reservoir with each other; and an opening/closing mechanism (4, 34, 39) that establishes or cuts off communication between the second reservoir and the metering hole, wherein the liquid material inside the first reservoir is transferred to the second reservoir by supplying the pressurized air through the first air pressure supply pipe in a state that the switching valve is held at the first position and the opening/closing mechanism (4, 34, 39) is held at an open position, and the liquid material inside the second reservoir is transferred to the first reservoir by supplying the pressurized air through the second air pressure supply pipe in the state that the switching valve is held at the first position and the opening/closing mechanism is held at the open position.