A microchip solution sending system comprising: a flow passage assembly that is at least provided with a fine flow passage that is provided with a detection region including a formed reaction field to which an antibody that reacts with a specific antigen is fixed; and a micro pump that is connected to the flow passage assembly and that is configured to send a specimen material solution that includes the specific antigen in a reciprocating manner, wherein the specimen material solution, which has been sent, passes through the detection region in a repetitive manner in the case in which the micro pump sends the specimen material solution in a reciprocating manner, the microchip solution sending system comprising a solution sending amount measurement means that is configured to measure the amount of a solution that is sent from the micro pump, and a solution sending direction switching means that is configured to reverse the solution sending direction of the micro pump, characterized in that the solution sending direction switching means is configured to control the micro pump to reverse the solution sending direction of the specimen material solution by issuing a command to the micro pump in order to switch an operation state of the micro pump from a discharge to a suction or from a suction to a discharge, when the amount of a solution that is sent by the micro pump measured by the solution sending amount measurement means reaches a predetermined solution sending amount (Qp) of the sent solution that has been stored in a storage means, wherein the solution sending amount (Qp) is set in advance as Q - Q1 that is obtained by subtracting a solution amount, which corresponds to a volume of a space of the detection region, from a total solution amount of the specimen material solution, such that the specimen material solution that has been sent in a reciprocating manner passes through the detection region in a repetitive manner in a state in which the detection region is filled with the specimen material solution on a constant basis. a flow passage assembly that is at least provided with a fine flow passage that is provided with a detection region including a formed reaction field to which an antibody that reacts with a specific antigen is fixed; and a micro pump that is connected to the flow passage assembly and that is configured to send a specimen material solution that includes the specific antigen in a reciprocating manner, wherein the specimen material solution, which has been sent, passes through the detection region in a repetitive manner in the case in which the micro pump sends the specimen material solution in a reciprocating manner, the microchip solution sending system comprising a solution sending amount measurement means that is configured to measure the amount of a solution that is sent from the micro pump, and a solution sending direction switching means that is configured to reverse the solution sending direction of the micro pump, characterized in that the solution sending direction switching means is configured to control the micro pump to reverse the solution sending direction of the specimen material solution by issuing a command to the micro pump in order to switch an operation state of the micro pump from a discharge to a suction or from a suction to a discharge, when the amount of a solution that is sent by the micro pump measured by the solution sending amount measurement means reaches a predetermined solution sending amount (Qp) of the sent solution that has been stored in a storage means, wherein the solution sending amount (Qp) is set in advance as Q - Q1 that is obtained by subtracting a solution amount, which corresponds to a volume of a space of the detection region, from a total solution amount of the specimen material solution, such that the specimen material solution that has been sent in a reciprocating manner passes through the detection region in a repetitive manner in a state in which the detection region is filled with the specimen material solution on a constant basis.