Disclosed is an automatic transaction apparatus provided with a bill storage section which is formed by configuring denomination-specific cassettes and a reject storage along a front and back direction of the apparatus; an upper conveying path through which bills that are conveyed into each part of an upper unit; and a lower conveying path connected to the upper conveying path and arranged in the lower unit and which conveys the bills to the denomination-specific cassette or the reject storage by branching off on the way. All the bills conveyed from the upper conveying path to the lower conveying path reach the lower conveying path through a common path. A bill storage part is mounted to be pulled out from the interior of the lower unit in the front and back direction of the apparatus. The lower conveying path makes the denomination-specific cassettes and the reject storage connected to the bill storage part in an upper opening manner. The lower conveying path is pulled out when the bill storage part is pulled out. The reject storage is demounted from the upper part by making the upper parts of the denomination-specific cassette and the reject storage in the opening state in the pulled state.