There are circumstances in which estimation of a pipe condition is desired as needs of water utility companies, and thus, an object of the present invention is to provide a technique that can estimate conditions of deterioration or a defect inside and outside a pipe.In order to solve the problem, a pipe condition detection system according to the present invention includes: a sensor unit that detects vibration data and pressure data from a pipe or fluid in the pipe; and a determination unit that determines conditions inside and outside the pipe, based on the vibration data and the pressure data acquired by the sensor unit.