Provided are a solution discharge device and a solution-discharge controlling method which enable highly accurate control of the discharge amount of a solution. A control unit 232 sequentially performs: in a state where a first opening/closing valve 212 is opened and a second opening/closing valve 223 is closed, control of moving a plunger 202 so as to suck, from a reagent container 141, a solution RS into a hollow part 201a of a syringe 201, and control of moving the plunger 202 so as to discharge a portion of the solution RS existing in the hollow part 201a to a first flow path 211; and, in a state where the first opening/closing valve 212 is closed and the second opening/closing valve 223 is opened, control of further moving the plunger 202 so as to discharge the solution existing in the hollow part 201a to a second flow path 222. The control unit 232 causes discharging of the solution RS to be finished in a state where an end surface 221a of a nozzle 221 is positioned in the discharged reagent solution RS and the distance between the end surface 221a and the surface of the solution RS is in a range of 0.1-1.0 mm.