To improve the durability of the pivotal support portion of a transport roller provided in a transportation rack arranged in a processing liquid tank storing each processing liquid without increasing the cost.

A plurality of transport rollers 84 formed so as to pivotally support a chemical-resistant core bar 84a by a bearing 90 made of a resin arranged in the base part 88 of the transportation rack provided in the processing liquid tank storing the processing liquid, is pivotally supported by the bearing 90 made of the resin. A retaining ring 93 made of a resin which is shakable in a thrust direction, is attached to a groove part 84c to prevent the dropping of the transport roller 84. A part 90b having a shape which prevents a mechanical interference to the corner 84k of the groove part is formed at the opening edge of a through-hole part 90a.