In an electrical device, a terminal block includes a mounting hole portion formed so as to be opened in a bottom surface and a mounting bore which is formed so as to be opened in a top surface, and connects the mounting hole portion and an outside of the top surface to each other, the swing-side interlock connector includes a swing-side housing which is mounted inside the mounting hole portion, and protrudes from the mounting bore, a cover is placed on the top surface of the terminal block by fitting a fitting hole to a protruding portion (31a) of the swing-side housing protruding from the mounting bore, and a gap portion which is formed around the protruding portion (31a), and connects the mounting hole portion and the outside of the top surface to each other is covered with the cover as viewed from the side of the housing opening portion.