The utility model discloses an electrical storage unit, an electrical storage apparatus and a working machine with the electrical storage apparatus. The electrical storage unit can be easily located, and under the state of superposing multiple electrical storage units, a compressing force can be applied on the electrical storage units. An electrical storage block is placed in a tray. The tray comprises a bottom surface part and side face parts standing up from the periphery part of the bottom surface part. An upper cover covers the tray. The upper cover comprises an upper surface part covering the opening part of the tray, and side face parts superposed with the side face parts of the tray. An electrode terminal is led to the outside from the space surrounded by the tray and the upper cover. An electrode of the electrical storage block is connected with the electrode terminal. When the upper cover covers the tray, if the compressing force in a height direction is applied on a frame composed of the tray and the upper cover, the upper cover moves towards the tray, and the compressing force is applied on the electrical storage block.