94 for forming or releasing a hydraulic pressure by a first solenoid valve s1 controlled on off by the transmission control unit a third port 96 for receiving the line pressure supplied from the manual valve mv through a line part 31 and a fourth port 98 for delivering the line pressure through a line part 33 to the forward drive clutch release valve 97 the spool cavity 34 of the second pressure control valve 16 includes a first port 100 for receiving the pressure of the line part 30 a second port 102 for forming or releasing the pressure by means of a second solenoid valve s2 controlled on off by the transmission control unit a third port 104 for receiving the line pressure via the line part 31 and a fourth port 106 for delivering the line pressure to the reverse drive clutch valve 28 the spool cavity 36 of the third pressure control valve 18 has a first port 108 for receiving the pressure of the line part 30 a second port 110 for forming or releasing the pressure by means of a third solenoid valve s3 controlled on off by the transmission control unit a third port 112 for receiving the line pressure of the line part 31 and a fourth port 114 for delivering the line pressure through a line part 37 to the second to third shift valve 26 the spool cavity 38 of the fourth pressure control valve 20 hag a first port 116 for receiving the pressure of the line part 30 a second port 118 for forming or releasing under the on off control of the transmission control unit a.