A mobility control method and device that can suppress an increase of location registration signaling are provided. In a mobile communication network including cells (21a, 21b) of multiple types differing in cell size, mobility determination times (T_reselection) are determined for individual neighbor cells (22a-29d) or individual neighbor cell types (Operation 303), and mobility control is performed by determining whether or not a predetermined mobility criterion remains satisfied during the mobility determination time set for a neighbor cell (Operations 304-306).