Automatic transmission hydraulic control device

In the present invention, an automatic transmission hydraulic control device comprises: a mechanical oil pump (6); an electric oil pump (106) that operates while an engine (2) is automatically stopped; and a hydraulic circuit (100) for controlling the supply of oil pressure to frictional engagement elements (40, 60) that are engaged at the time of vehicle departure in the automatic transmission. The hydraulic circuit causes discharge oil that is discharged from the electric oil pump to drain from a prescribed drain portion (154) at the time of a first state (a state in which the source of the supply of oil pressure to the frictional engagement elements is the mechanical oil pump) of a switching valve (120), and suppresses draining of the discharge oil from the drain portion at the time of a second state (a state in which the source of the supply of oil pressure is the electric oil pump) of the switching valve (120) compared to the first state.