To provide a bag holder with which a wastebasket can be composed of a plastic bag or paper bag when required, which does not occupy so large space, facilitates post handling, and can be stored without occupying the space when not required, to solve the problem that a car has no room for a wastebasket to dispose of trash or waste paper, and which can be also used at an office or home.

A sheet material is cut or partially folded to form a holding portion for a bag and a holding portion for fixing itself by being inserted into a gap between a window and a window frame, or a gap of a drawer of a desk, furniture, or the like.