A control device for an automatic transmission, which controls the automatic transmission having: a mechanical oil pump driven by a rotation of an engine transmitted thereto; an intake passage through which a working oil suctioned into the mechanical oil pump flows; a discharge passage having a narrowed portion, through which the working oil discharged from the mechanical oil pump flows; a connecting passage that connects the intake passage to the discharge passage on an upstream side of the narrowed portion in a flow direction of the working oil while bypassing the mechanical oil pump; and a flow control mechanism including a spool that sets the connecting passage in a communicative state when a differential pressure between an oil pressure on the upstream side of the narrowed portion in the flow direction of the working oil and an oil pressure on a downstream side of the narrowed portion in the flow direction of the working oil exceeds a predetermined value, and sets the connecting passage in a non-communicative state when the differential pressure is equal to or lower than the predetermined value, the control device comprising: oil temperature detecting means adapted to detect an oil temperature of the working oil; engine torque calculating means adapted to calculate an engine torque; line pressure setting means adapted to set a line pressure to be higher as the engine torque increases; and line pressure correcting means adapted to raise the line pressure above the line pressure set by the line pressure setting means when the oil temperature is equal to or higher than a predetermined oil temperature at which the connecting passage switches from the communicative state to the non-communicative state due to air mixed into the working oil and the engine torque is equal to or smaller than a predetermined engine torque at which the connecting passage switches from the communicative state to the non-communicative state due to the air mixed into the working oil. a mechanical oil pump driven by a rotation of an engine transmitted thereto; an intake passage through which a working oil suctioned into the mechanical oil pump flows; a discharge passage having a narrowed portion, through which the working oil discharged from the mechanical oil pump flows; a connecting passage that connects the intake passage to the discharge passage on an upstream side of the narrowed portion in a flow direction of the working oil while bypassing the mechanical oil pump; and a flow control mechanism including a spool that sets the connecting passage in a communicative state when a differential pressure between an oil pressure on the upstream side of the narrowed portion in the flow direction of the working oil and an oil pressure on a downstream side of the narrowed portion in the flow direction of the working oil exceeds a predetermined value, and sets the connecting passage in a non-communicative state when the differential pressure is equal to or lower than the predetermined value, oil temperature detecting means adapted to detect an oil temperature of the working oil; engine torque calculating means adapted to calculate an engine torque; line pressure setting means adapted to set a line pressure to be higher as the engine torque increases; and line pressure correcting means adapted to raise the line pressure above the line pressure set by the line pressure setting means when the oil temperature is equal to or higher than a predetermined oil temperature at which the connecting passage switches from the communicative state to the non-communicative state due to air mixed into the working oil and the engine torque is equal to or smaller than a predetermined engine torque at which the connecting passage switches from the communicative state to the non-communicative state due to the air mixed into the working oil.