A drug solution administration device includes a bolus administration unit providing a drug solution. The bolus administration unit 110 includes: an inflow passage 111； an outflow passage 112； a reservoir 113 connected between the inflow passage 111 and the outflow passage 112, and reserving the drug solution； and a control portion 114 controlling the reserve of the drug solution in the reservoir 113 and dispensing of the drug solution from the reservoir 113. The inflow passage 111 includes: a first flow passage 111A； and a second flow passage 111B smaller in flow passage cross-sectional area than the first flow passage 111A, and the control portion 114 includes: a first closer 141 closing the first flow passage 111A； and a second closer 142 operable to open and close the outflow passage 112.
