To provide an oxide sintered body capable of stably forming a transparent conductive film and a transparent semi-conductive film of a zinc oxide-tin oxide system regardless of a method for forming the film.

A oxide sintered body mainly includes a zinc stannate compound phase and a metal tin phase, and the metal tin phase is uniformly dispersed in the oxide sintered body, and the atomic number ratio of tin to the total of zinc and tin Sn/(Zn+Sn) is 0.1-0.9. The oxide sintered body preferably furthermore includes a zinc oxide phase.