To make it possible to simply turn off the electrical connection between a primary side connection piece and a secondary side connection piece of a terminal block by merely operating an operation member.SOLUTION: A terminal block includes a terminal block main body 500A formed of an insulating material, a primary side connection piece 100A incorporated in the terminal block main body 500A, a secondary side connection piece 200A which is incorporated in the terminal block main body 500A in a non-connected state with the primary side connection piece 100A, a movable conductive piece 300A which is incorporated in the terminal block main body 500A to turn on or off the connection between the primary side connection piece 100A and the secondary side connection piece 200A, an elastic body 400A that elastically urges the movable conductive piece 300A in a direction in which the primary side connecting piece 100A and the secondary side connecting piece 200A are connected to each other, and an operating member 600A for displacing the movable conductive piece 300A against the elastic body 400A in order to turn off the connection between the primary side connecting piece 100A and the secondary side connecting piece 200A. The primary side connection piece 100A has a short-circuit piece 120A protruding from the terminal block main body 500A.SELECTED DRAWING: Figure 1