A powder container includes a containing portion having an opening; an opening/closing member that is movable between an open position and a closed position and supported with play; an opening restraining portion provided on the containing portion; an opening restrained portion provided on the opening/closing member; an urging member that urges the opening/closing member; and an opening/closing contact portion provided on the opening/closing member and contactable with an opening/closing contacted portion of an apparatus into which the containing portion is installed, wherein the opening restrained portion is disposed such that a direction of force generated when the containing portion is installed into the apparatus is inclined with respect to the direction in which the opening/closing member moves, and the opening restrained portion is disposed downstream of an imaginary line extending from a contact position at which the opening/closing contact portion contacts the opening/closing contacted portion.