A solution supply apparatus is for supplying a treatment solution to a treatment solution discharger which discharges the treatment solution to a treatment object. The solution supply apparatus includes: a supply pipe line connected to the treatment solution discharger; a filter provided on the supply pipe line which filters the treatment solution to remove foreign substances; and a controller. The controller performs a determination of a state of the treatment solution to be supplied to a primary side of the filter and, when the state of the treatment solution is determined to be bad, outputs a control signal for restricting supply of the treatment solution to the primary side of the filter.