To provide a Western-style toilet bowl capable of being completely deodorized by use of negative ions.

This Western-style toilet bowl having a toilet bowl body 1 and a toilet bowl seat 2 attached onto it in such a way as to be freely openable and closable comprises a seat part 2a formed as a hollow tube on the periphery of the toilet bowl seat 2, an opening part 10, which opens at the rear side of the seat part 2a into the toilet bowl body, a negative ion generating means provided inside the seat part 2a and an exhaust duct 4 connected to the seat part.