A hydraulic circuit for supplying hydraulic pressure to frictional engagement elements in an automatic transmission including an oil passage connecting an output port through which a drive pressure is output, and a second signal pressure port, of a second clutch application relay valve, and an oil passage connecting an output port through which a modulator pressure is output and the second signal pressure port, are formed in a valve body and arranged such that it is possible to open the oil passage, as well as close the oil passage, with an oil passage closing member. With the hydraulic circuit it is possible to change a formed speed in response to a shift operation when a shift, after being operated from a travel position to a non-travel position, is returned again from the non-travel position, at a time of failure.