A traveling vehicle system comprising: a track including a first track extending along a first direction, a second track extending along a second direction different from the first direction, and a connection track adjacent to the first track in the first direction, adjacent to the second track in the second direction, and placed with a gap with respect to each of the first track and the second track; and a ceiling traveling vehicle configured to travel along the track, the track having: a first guide face provided along the first track; and a second guide face provided along the second track, and the ceiling traveling vehicle including: a traveling wheel configured to roll on the first track, on the second track, and on the connection track; a main body placed below the track; a coupler coupling a wheel shaft of the traveling wheel and the main body to each other and passing through the gap when the traveling wheel rolls on the connection track; a direction changer configured to switch between a first state in which the traveling wheel rolls on the first track, and a second state in which the traveling wheel rolls on the second track, by turning the coupler about a turning axis with respect to the main body; and a guider provided in the coupler, moving along the first guide face in the first state, and moving along the second guide face in the second state, characterized in that the first guide face is a side face of the first track, and the second guide face is a side face of the second track. a track including a first track extending along a first direction, a second track extending along a second direction different from the first direction, and a connection track adjacent to the first track in the first direction, adjacent to the second track in the second direction, and placed with a gap with respect to each of the first track and the second track; and a ceiling traveling vehicle configured to travel along the track, the track having: a first guide face provided along the first track; and a second guide face provided along the second track, and a first guide face provided along the first track; and a second guide face provided along the second track, and the ceiling traveling vehicle including: a traveling wheel configured to roll on the first track, on the second track, and on the connection track; a main body placed below the track; a coupler coupling a wheel shaft of the traveling wheel and the main body to each other and passing through the gap when the traveling wheel rolls on the connection track; a direction changer configured to switch between a first state in which the traveling wheel rolls on the first track, and a second state in which the traveling wheel rolls on the second track, by turning the coupler about a turning axis with respect to the main body; and a guider provided in the coupler, moving along the first guide face in the first state, and moving along the second guide face in the second state, a traveling wheel configured to roll on the first track, on the second track, and on the connection track; a main body placed below the track; a coupler coupling a wheel shaft of the traveling wheel and the main body to each other and passing through the gap when the traveling wheel rolls on the connection track; a direction changer configured to switch between a first state in which the traveling wheel rolls on the first track, and a second state in which the traveling wheel rolls on the second track, by turning the coupler about a turning axis with respect to the main body; and a guider provided in the coupler, moving along the first guide face in the first state, and moving along the second guide face in the second state, characterized in that the first guide face is a side face of the first track, and the second guide face is a side face of the second track.