A semiconductor device includes a first pad to which a high voltage is to be input, a second pad to which a low voltage is to be input, a third pad to which a ground voltage is to be input, and a protection circuit provided between the first pad and the third pad. The protection circuit includes a first protection element group including a plurality of first transistors arranged in a first direction, a second protection element group including a plurality of second transistors arranged in the first direction and disposed apart from the first protection element group in a second direction orthogonal to the first direction, a guard ring provided around the first and second protection element groups, and an intermediate guard ring provided between the first protection element group and the second protection element group and connected to the third pad via a resistance element.