Patent ID: 7189620

Claim:
A semiconductor device comprising: an N-type semiconductor substrate; a transistor including, a first P-type impurity introduced region formed in a main surface of said semiconductor substrate and constituting a main junction together with said semiconductor substrate, an N-type impurity introduced region formed in said main surface of said semiconductor substrate and functioning as a source or an emitter of said transistor, a first trench formed in said main surface of said semiconductor substrate in a portion where said N-type impurity introduced region is formed, an insulating film formed on an inner wall of said first trench and functioning as a gate insulating film of said transistor, and a conductive film formed to fill in said first trench and functioning as a gate electrode of said transistor; and a channel stop structure formed in a peripheral portion of said semiconductor substrate, wherein said channel stop structure includes a second trench formed in said main surface of said semiconductor substrate, and a second P-type impurity introduced region formed in said main surface of said semiconductor substrate.