To provide a suction cup obviating the defects wherein abrasion of elastic materials in use impairs airtightness, which is an important function, or prevents vacuum action being exerted.

The suction cup is constituted of a vent portion, made of an elastic material such as rubber, leading to a air pump and a skirt part stretching therefrom outward. The inner surface of the skirt part is furnished with at least one annularly formed peripheral groove and plural vertical grooves formed from the peripheral grooves toward the vent portion. The vertical grooves are divided into at least two types different from one another in depth.