Reduction of labor for maintenance work of unmanned agricultural machines is desired.A storage system for accommodating a first attachment removably mounted on a working machine having an autonomous moving function, which holds a housing formed with space for accommodating working machines and a first attachment removed from the working machine A holding portion is provided.The holding portion utilizes the operation of the working machine to hold the first attachment.The holding portion may hold the first attachment utilizing the operation of the working machine moving around the holding portion.Diagram
