PROBLEM TO BE SOLVED: To provide a bath apparatus with illumination in which a light source disposed on the outer side of a bathtub is easily detached and attached in maintenance. SOLUTION: The bathtub apparatus with the illumination includes: a translucent bathtub; two connected light sources having a flexible connection body and a plurality of light sources supported by the connection body; and a guide member peripherally disposed on the outer side of the bathtub, and capable of inserting and removing the connected light sources. The connected light source includes a first connected light source body and a second connected light source body. For the guide member, a first fitting/removing part on one end side of the guide member, capable of inserting and removing the first connected light source body, and a second fitting/removing part on the other end side of the guide member, capable of inserting and removing the second connection light body, are formed. COPYRIGHT: (C)2010,JPO&INPIT