Semiconductor device

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A semiconductor device including an oxide semiconductor can have stable electric characteristics and high reliability. A transistor in which an oxide semiconductor layer containing indium, titanium, and zinc is used as a channel formation region and a semiconductor device including the transistor are provided. As a buffer layer in contact with the oxide semiconductor layer, a metal oxide layer containing an oxide of one or more elements selected from titanium, aluminum, gallium, zirconium, hafnium, and a rare earth element can be used.