An electrophotographic image forming apparatus for forming an image on a recording material, wherein a process cartridge is detachably mountable to a main assembly of said apparatus, said apparatus comprising: (i) a main assembly positioning portion; (ii) an urging member (45, 46); (iii) mounting means for detachably mounting said process cartridge; (iv) feeding means (14, 15, 17, 18) for feeding the recording material; and (v) said process cartridge which comprises: an electrophotographic photosensitive drum; process means (5, 6a) actable on said electrophotographic photosensitive drum; a cartridge positioning portion for engagement with the main assembly positioning portion provided in the main assembly of the apparatus to position said process cartridge with respect to a direction crossing with the direction of the axis of said electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of the apparatus in a direction parallel with the axis of said photosensitive drum; and a pressure catching member (36, 102) provided at a downstream position with respect to a mounting direction in which said process cartridge is mounted to the main assembly of the apparatus, said pressure catching member (36, 102) is movable between a first position (36 - Fig. 6; 102 - Figs. 19 and 26) at which said pressure catching member (36, 102) contacts the main assembly of the apparatus in the mounting direction in the process of mounting of said process cartridge to the main assembly of the apparatus, and a second position (36 - Figs. 8 and 9; 102 - Figs. 17 and 27), wherein in said second position, said pressure catching member (36, 102) is adapted to be contacted by the urging member (45, 46) provided in the main assembly of the apparatus and to receive a force in the crossing direction so as to contact said cartridge positioning portion to the main assembly positioning portion to position said process cartridge in the crossing direction, when said process cartridge is mounted to the main assembly of the apparatus. (i) a main assembly positioning portion; (ii) an urging member (45, 46); (iii) mounting means for detachably mounting said process cartridge; (iv) feeding means (14, 15, 17, 18) for feeding the recording material; and (v) said process cartridge which comprises: an electrophotographic photosensitive drum; process means (5, 6a) actable on said electrophotographic photosensitive drum; a cartridge positioning portion for engagement with the main assembly positioning portion provided in the main assembly of the apparatus to position said process cartridge with respect to a direction crossing with the direction of the axis of said electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of the apparatus in a direction parallel with the axis of said photosensitive drum; and a pressure catching member (36, 102) provided at a downstream position with respect to a mounting direction in which said process cartridge is mounted to the main assembly of the apparatus, said pressure catching member (36, 102) is movable between a first position (36 - Fig. 6; 102 - Figs. 19 and 26) at which said pressure catching member (36, 102) contacts the main assembly of the apparatus in the mounting direction in the process of mounting of said process cartridge to the main assembly of the apparatus, and a second position (36 - Figs. 8 and 9; 102 - Figs. 17 and 27), wherein in said second position, said pressure catching member (36, 102) is adapted to be contacted by the urging member (45, 46) provided in the main assembly of the apparatus and to receive a force in the crossing direction so as to contact said cartridge positioning portion to the main assembly positioning portion to position said process cartridge in the crossing direction, when said process cartridge is mounted to the main assembly of the apparatus. an electrophotographic photosensitive drum; process means (5, 6a) actable on said electrophotographic photosensitive drum; a cartridge positioning portion for engagement with the main assembly positioning portion provided in the main assembly of the apparatus to position said process cartridge with respect to a direction crossing with the direction of the axis of said electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of the apparatus in a direction parallel with the axis of said photosensitive drum; and a pressure catching member (36, 102) provided at a downstream position with respect to a mounting direction in which said process cartridge is mounted to the main assembly of the apparatus, said pressure catching member (36, 102) is movable between a first position (36 - Fig. 6; 102 - Figs. 19 and 26) at which said pressure catching member (36, 102) contacts the main assembly of the apparatus in the mounting direction in the process of mounting of said process cartridge to the main assembly of the apparatus, and a second position (36 - Figs. 8 and 9; 102 - Figs. 17 and 27), wherein in said second position, said pressure catching member (36, 102) is adapted to be contacted by the urging member (45, 46) provided in the main assembly of the apparatus and to receive a force in the crossing direction so as to contact said cartridge positioning portion to the main assembly positioning portion to position said process cartridge in the crossing direction, when said process cartridge is mounted to the main assembly of the apparatus.