This transfer switch has movable contactors moving to connect a load side fixed contactor alternatively to two different current source side fixed contactors. The movable contactors are operatively connected with a control shaft moving along either inclined path of a substantially V-shaped guide groove and the current source selected by the movable contactor is determined by which inclined path of the guide groove the control shaft follows. The inclined path along which the control shaft moves is determined by the direction of the inclination of a point plate closing the inclined path by inclining to either side. The control shaft rises along either of the inclined paths of the guide groove as operatively connected with a rotating motion against a returning spring by a manual or electric operation of an operating lever. When the operating lever is in the original position, the control shaft will be positioned in the middle of the guide groove and the movable contactors will be in neutral positions. The operating lever engages a latch at the end of the rotation. This latch can be manually or electrically disengaged with the operating lever. The point plate is energized by a spring so as to normally incline in one direction. The inclining direction can be reversed manually or electrically.