A cartridge includes a case member (500) and a shutter member (100). The case member (500) includes a upper case section (505) and a lowercase section (506). A step portion (507) is formed at a boundary (508) between the upper case section (505) and the lower case section (506). The upper case section (505) includes a shutter pressing section (517) including a plurality of eaves sections (510). Each of the plurality of eaves sections (510) is configured to engage with the eaves engagement section (104) of the shutter member (100). At least two of the plurality of eaves sections (510) are located spaced apart from each other by a predetermined distance (519). The lower case section (505) includes a connection portion (520). The connection portion (520) is connected to the step portion (507) at a location between the at least two eaves sections (510), which are located spaced apart from each other by the predetermined distance (519), of the plurality of eaves sections (510).