A map information update system according to the present disclosure includes multiple mobile robots that each acquire information on an intention of a user to move and information on a mobile robot position, one or multiple environment information acquiring robot(s) that each acquire(s) environment information, and a server that updates map information based on the information on the intention of the user to move, the information on the mobile robot position, and the environment information, and each of the multiple mobile robots includes a main body part, a handle part, a detecting part, a moving device, a guide information producing part, a presenting part, a user move intention estimating part, a mobile robot position estimating part, and a communicating part.