PROBLEM TO BE SOLVED: To provide a bathtub in which a porous plate generating air bubbles can be placed on a wide area of an inner bottom face of the bathtub, and further with which the porous plate generating fine air bubbles, being a ceramic porous plate, can easily be obtained, and to provide a component of the bathtub and a production method of them.SOLUTION: A porous plate unit 20 comprises: a porous plate 24 consisting of pottery with communication holes communicating from one face to the other face thereof and formed therethrough and a planar porous plate holding part 22 consisting of pottery, without air permeability, and surface-joined to one face of the porous plate 24. In the porous plate unit 20, a long hole-shaped air passage 30B extending in the surface direction of the porous plate 24, branching or curving, and communicating with the communication holes is formed inside the porous plate 24 or on a boundary between the porous plate 24 and the porous plate holding part 22, and an introduction port 30A to introduce a gas to the air passage 30B is formed.COPYRIGHT: (C)2014,JPO&INPIT【課題】気泡を発生させる多孔質板を浴槽の内底面に広く設置することができ、さらには、陶製の多孔質板において、きめの細かい気泡を発生させることができる多孔質板を容易にえることができる浴槽とその構成部品及びそれらの製造方法を提供することである。【解決手段】一面から他面にかけて連通する連通孔が形成された焼き物から成る多孔質板24と、前記多孔質板24の一面と面接合し、通気性のない焼き物から成る板状の多孔質板保持部22と、を備え、前記多孔質板24の内部、又は前記多孔質板24と前記多孔質板保持部22との境界部に、前記多孔質板24の面方向に延出して分岐又は曲行し、前記連通孔と導通する長孔状の通気路30Bが形成され、前記通気路30Bに気体を導入する導入口30Aが形成された多孔質板ユニット20。【選択図】図1
