A drug solution administration unit (10,110,210,310,410), comprising: a drug solution administration module comprising a first flow path unit including an upstream side main body where a first flow path to store drive solution is formed, a second flow path unit including a downstream side main body where a second flow path to store drug solution is formed, and a drive mechanism unit including a pair of electrodes (44a,44b) and a porous body sandwiched between the pair of electrodes (44a,44b), the drive mechanism unit having a connecting flow path connecting a downstream end of the first flow path and an upstream end of the second flow path; and a drug solution administration device (20,120) to which the drug solution administration module is mounted, wherein the drug solution administration module has a drug solution connecting unit at a downstream end of the second flow path, characterized in that the drug solution administration device (20,120) comprises: a housing where a containment unit to store the drug solution administration module is formed, inside of the housing, a branch path where the second flow path is connected, and inside of the housing, a main path that is branched from a downstream side of the branch path and connected to an intravenous tube, the main path connects an upstream connecting unit with a downstream connecting unit, the upstream connecting unit connects the main path with the intravenous tube on the upstream side, the downstream connecting unit connects the main path with the intravenous tube on the downstream side, wherein the drug solution administration device (20,120) has a flow path connecting unit at an upstream end of the branch path to which the drug solution connecting unit is connected. a first flow path unit including an upstream side main body where a first flow path to store drive solution is formed, a second flow path unit including a downstream side main body where a second flow path to store drug solution is formed, and a drive mechanism unit including a pair of electrodes (44a,44b) and a porous body sandwiched between the pair of electrodes (44a,44b), the drive mechanism unit having a connecting flow path connecting a downstream end of the first flow path and an upstream end of the second flow path; and a drug solution administration device (20,120) to which the drug solution administration module is mounted, wherein the drug solution administration module has a drug solution connecting unit at a downstream end of the second flow path, characterized in that the drug solution administration device (20,120) comprises: a housing where a containment unit to store the drug solution administration module is formed, inside of the housing, a branch path where the second flow path is connected, and inside of the housing, a main path that is branched from a downstream side of the branch path and connected to an intravenous tube, the main path connects an upstream connecting unit with a downstream connecting unit, the upstream connecting unit connects the main path with the intravenous tube on the upstream side, the downstream connecting unit connects the main path with the intravenous tube on the downstream side, wherein the drug solution administration device (20,120) has a flow path connecting unit at an upstream end of the branch path to which the drug solution connecting unit is connected. a housing where a containment unit to store the drug solution administration module is formed, inside of the housing, a branch path where the second flow path is connected, and inside of the housing, a main path that is branched from a downstream side of the branch path and connected to an intravenous tube, the main path connects an upstream connecting unit with a downstream connecting unit, the upstream connecting unit connects the main path with the intravenous tube on the upstream side, the downstream connecting unit connects the main path with the intravenous tube on the downstream side, wherein the drug solution administration device (20,120) has a flow path connecting unit at an upstream end of the branch path to which the drug solution connecting unit is connected.