PURPOSE: To provide a showcase having a movable door smoothly, safely, and surely opened/closed despite of a simple structure.

CONSTITUTION: Upper and lower edges in the adjacent of a fixed rail side end part of a movable door 4 in a closed position is sorted by a touch bearing 101 and a ball bearing 102, and these touch bearing 101 and ball bearing 102 are guided from the closed position to a position continuing to end parts 14a, 15a of adjoining fixed rails 14, 15 along the first guide rails 111, 112. The upper and lower edges in the adjacent of the unfixed rail side ends of the movable door 4 in the closed position are supported by the touch bearing 201 and the ball bearing 202 so that these touch bearing 201 and ball bearing 202 are guided from the closed position to a position continuing to the end parts 14a, 15a of the adjoining fixed rails 14, 15 along the second guide rails 211, 212.