[Subject] To provide a size measuring device that can be readily handled and easily used for a size-taking process by even a user who has no specialized size-taking technique, a managing server, a user terminal and a size measuring system.
[Means to Solve Problems] The size measuring system is provided with a size measuring device 10 that is attached to a user's body so as to measure the size of the user's body, and outputs sensor measurement information indicating the measured size or the like, a user terminal 20 operated by the user who measures the body and a managing server 30 that manages information or the like of the size and shape of apparel commodities, and based upon the sensor measurement information, supplies user size information corresponding to the information of the body size of the user and commodity retrieval results information corresponding to information about commodities that fit to the size to the user terminal 20.