Traveling vehicle system

A traveling vehicle system comprising:

• a track;
• and
• a traveling vehicle to travel on the track;
• wherein
• the track includes a plurality of first tracks along a first direction, a plurality of second tracks along a second direction perpendicular or substantially perpendicular to the first direction, and a partial track at a portion where an extension line of the first track and an extension line of the second track intersect;
• the traveling vehicle includes a traveler to travel on an upper side of the track, a main body below the track, and a coupler to couple the traveler and the main body;
• a gap through which the coupler passes when the traveling vehicle travels is between the first track and the partial track, and between the second track and the partial track;
• the traveler includes four wheels to travel on the track, and a direction changer to change a traveling direction of the traveling vehicle between the first direction and the second direction by turning the four wheels respectively around four turning axes which are perpendicular or substantially perpendicular to respective axles of the wheels;
• and
• in a plan view, none of sides of a quadrilateral with the four turning axes defining vertices thereof is parallel to the first track or the second track.