To provide the subject trousers inhibiting the swelling of its knee parts generating when uprightly sitting during wearing by sewing side parts and the inside thigh parts of the front body of a face side cloth and the front body of a rear side cloth and forming a space between the front body of the face side cloth and the front body of the rear side cloth.

In the trousers 1, the front body 3 of a rear side cloth is provided on the rear face of the front body 2 of a face side cloth and the side parts and the inside thigh, parts of the front body 2 of the face side cloth and the front body 3 of the rear side cloth are sewn, then a space is formed between the front body 2 of the face side cloth and the front body 3 of the rear side cloth. Preferably, a rear side cloth for a knee not having stretchability is provided on a knee position 5 of the rear face of the front body 2 of the face side cloth of the trousers to obtain the objective trousers. Preferably, a cut line of a cloth obtained by extending the knee position 5 of the front body 2 of the face side cloth longitudinally and transversely extended by steam as long as possible exists on a straight line for sewing.