PROBLEM TO BE SOLVED: To provide an electronic recording medium for recording a history entering in a low-pressure room, which allows anyone to simply and easily enter the low-pressure room at any time and anywhere, where conventionally, only few athletes of Olympic medalists class and specific persons engaged in the research of low-pressure rooms can enter, records a room-entering history of customers entering the low-pressure room on electronic recording media and provides them to the customers. SOLUTION: In a low-pressure room service shop including a low-pressure room, a pressure control device for controlling the pressure of the low-pressure room, a personal computer having a means for importing pressure control data of the pressure control device by electric signals, and an electronic recording medium recording device for recording the pressure control data imported in the personal computer into the electronic recording medium, the electronic recording media for recording the history entering in the low-pressure room records the low-pressure room entering history of the customers entering the low-pressure room and provides the customers with the electronic recording media. COPYRIGHT: (C)2008,JPO&INPIT