A semiconductor device includes: a semiconductor chip having a switching element and multiple pads electrically connected to the switching element; and multiple lead terminals electrically connected to the respective pads. The multiple lead terminals include a control terminal used for control of on/off operation of the switching element, and a main terminal into which a main current flows when the switching element is in an on state. A coupling coefficient k falls within a range of −3%≦k≦2%, where the coupling coefficient k is defined by a parasitic inductance Lg in a current path of a control current flowing in the control terminal, a parasitic inductance Lo in a current path of the main current, and a mutual inductance Ms of the parasitic inductances Lg and Lo.