An information collection system includes an on-vehicle device and a server, wherein the on-vehicle device includes a first transmission signal transmitting part configured to transmit a first transmission signal to the server when the vehicle event is detected, and an upload executing part configured to transmit the vehicle event data to the server when the upload demand is received. The server includes a determining part configured to determine, based on the determination purposes information, when the first transmission is received, whether the information acquisition condition is met, an upload demanding part configured to transmit the upload demand to the on-vehicle device when it is determined that the information acquisition condition is met, and a vehicle event data receiving part configured to receive the vehicle event data transmitted from the on-vehicle device.