Abstract: Provided is a plug conversion adapter which can easily open a shutter even in the case of a BF type AC power plug socket and can also be used in other types of AC power plug sockets. The interval between a pair of electrode pins can be controlled by operating a pair of first movable members, and thus the plug conversion adapter can be used in a larger number of types of AC power plug sockets. The interval between the pair of first movable members is restricted by a second movable member at a maximum, and thus a shutter can also be easily opened even in the case of an AC power plug socket that has a structure in which the shutter is opened by pushing both corners of the pair of electrode pin insertion openings.

Abstract: A coalescent type power supply conversion plug is capable of connecting to different power supply plug sockets. The plug includes a first adapter having two round bar-shaped plug terminals so that a pitch width of plug terminals is adjustable. A pin for earth hole for B type, C type and SE type is foldably provided in the center portion of the plug terminals, and a plug-in port connectable to the sockets of all the types is provided in the rear end surface. Another pin for flat plate-shaped hole for BF type and a pin for round bar shaped earth hole for B3 type is foldably provided in a second adapter. Flat plate-shaped plug terminals and a pin for earth hole are provided in the plug terminals. A plug-in port connectable to the sockets of all kinds is provided in the rear end surface.