An image formation apparatus comprising: a main body; an image formation part comprising a photoreceptor (2a-2d), provided inside the main body so that the image formation part can be attached to the main body and detached from the main body; a waste toner assembly which opens and closes an opening part to attach the image formation part to the main body or detach the image formation part from the main body, and which comprises a release lever and a transport part transporting a waste toner generated by the image formation part to a waste toner bottle; a retainer holding an axis part of the photoreceptor of the image formation part; a pair of locking parts (30a, 30b) latching the waste toner assembly to the main body; and a pair of locking parts (64a, 64b) latching the retainer to the main body, characterized in that: the waste toner assembly is rotatable via a supporting axis (12a, 12b) provided at a lower end part of the waste toner assembly; the retainer is rotatable via a supporting axis (61a, 61b) provided at an upper end part of the retainer; and the image formation apparatus is adapted such that: when a release operation of the release lever releasing the pair of locking parts (30a, 30b) latching the waste toner assembly to the main body is performed, the pair of locking parts (64a, 64b) latching the retainer to the main body is also released; and when the waste toner assembly and the retainer are closed, an upper end part of the waste toner assembly is positioned so as to cover at least a part of the retainer viewed from a direction in which the waste toner assembly and the retainer are closed; and when the waste toner assembly and the retainer are closed, the release lever is positioned so as to cover the retainer of the waste toner assembly viewed from a direction in which the waste toner assembly and the retainer are closed. a main body; an image formation part comprising a photoreceptor (2a-2d), provided inside the main body so that the image formation part can be attached to the main body and detached from the main body; a waste toner assembly which opens and closes an opening part to attach the image formation part to the main body or detach the image formation part from the main body, and which comprises a release lever and a transport part transporting a waste toner generated by the image formation part to a waste toner bottle; a retainer holding an axis part of the photoreceptor of the image formation part; a pair of locking parts (30a, 30b) latching the waste toner assembly to the main body; and a pair of locking parts (64a, 64b) latching the retainer to the main body, characterized in that: the waste toner assembly is rotatable via a supporting axis (12a, 12b) provided at a lower end part of the waste toner assembly; the retainer is rotatable via a supporting axis (61a, 61b) provided at an upper end part of the retainer; and the image formation apparatus is adapted such that: when a release operation of the release lever releasing the pair of locking parts (30a, 30b) latching the waste toner assembly to the main body is performed, the pair of locking parts (64a, 64b) latching the retainer to the main body is also released; and when the waste toner assembly and the retainer are closed, an upper end part of the waste toner assembly is positioned so as to cover at least a part of the retainer viewed from a direction in which the waste toner assembly and the retainer are closed; and when the waste toner assembly and the retainer are closed, the release lever is positioned so as to cover the retainer of the waste toner assembly viewed from a direction in which the waste toner assembly and the retainer are closed. the waste toner assembly is rotatable via a supporting axis (12a, 12b) provided at a lower end part of the waste toner assembly; the retainer is rotatable via a supporting axis (61a, 61b) provided at an upper end part of the retainer; and the image formation apparatus is adapted such that: when a release operation of the release lever releasing the pair of locking parts (30a, 30b) latching the waste toner assembly to the main body is performed, the pair of locking parts (64a, 64b) latching the retainer to the main body is also released; and when the waste toner assembly and the retainer are closed, an upper end part of the waste toner assembly is positioned so as to cover at least a part of the retainer viewed from a direction in which the waste toner assembly and the retainer are closed; and when the waste toner assembly and the retainer are closed, the release lever is positioned so as to cover the retainer of the waste toner assembly viewed from a direction in which the waste toner assembly and the retainer are closed. when a release operation of the release lever releasing the pair of locking parts (30a, 30b) latching the waste toner assembly to the main body is performed, the pair of locking parts (64a, 64b) latching the retainer to the main body is also released; and when the waste toner assembly and the retainer are closed, an upper end part of the waste toner assembly is positioned so as to cover at least a part of the retainer viewed from a direction in which the waste toner assembly and the retainer are closed; and when the waste toner assembly and the retainer are closed, the release lever is positioned so as to cover the retainer of the waste toner assembly viewed from a direction in which the waste toner assembly and the retainer are closed.