A semiconductor device includes: a semiconductor element having a first main electrode and a second main electrode; a first heat dissipation member and a second heat dissipation member; and a lead frame including a first main terminal connected to the first heat dissipation member and a second main terminal connected to the second main electrode. The second main terminal includes a connection portion connected with the second main electrode, a facing portion extending from the connection portion and facing the first heat dissipation member, and a non-facing portion. The non-facing portion and the first main terminal are arranged in a direction orthogonal to a thickness direction. A side surface of the first main terminal and a side surface of the non-facing portion of the second main terminal face each other.