PURPOSE: To improve the controllability of blind operation by providing and controlling independently a blind slat lifting motor and a slat angle adjusting motor.

CONSTITUTION: When a lifting switch 21 or lowering switch 23 of a controller 2 is turned ON, a current is supplied to a lifting motor 4 to rotate a lift shaft 13, and the rotation of the lift shaft 13 is transmitted to a rotary drum 9 and an encoder drum 11. A take-up drum 9 takes up or unwinds a lifting tape 15 to vertically move a bottom rail 18 and a slat 17. When an opening switch 24 or closing switch 25 of the controller 2 is turned ON, a current is supplied to a slat adjusting motor 5 to rotate a tilt shaft 14 and the rotation of the tilt shaft 14 is transmitted to a tilt drum. Further, a ladder code 16 is taken up or unwound to adjust the opening and closing angle of the slat 17.