An end section member for an image forming apparatus comprising: a shaft member , a bearing member to be disposed in an end section of a photoreceptor drum, wherein the shaft member includes a spherical body of which at least one part is spherical and a rotating force transmission pin provided to protrude from the spherical body, the shaft member being swingably installed to the bearing member, the bearing member comprising: a concave section in which one section is opened and a bottom section on a side opposite to the one section has a curved surface along the spherical body, the concave section configured to receive the spherical body therein; and at least two swing grooves being grooves which are provided on a side surface of the concave section and into which end sections of the rotating force transmission pin are configured to be inserted, wherein the swing grooves at least include a parallel part which is parallel to the axis of the bearing member and a curved part curved toward the axis, wherein a bottom section side of the concave section when viewed from the opened side of the concave section is at a position which is closer to an axis side than the opened side of the concave section or at the same position as that of the axis side, on an arbitrarily adjacent cross section which is orthogonal to the direction of the axis of the spherical body receiving section, wherein the shaft member is prevented from being removed from the bearing member as the rotating force transmission pin of the shaft member is hooked to the curved part of the swing groove of the bearing member. a shaft member , a bearing member to be disposed in an end section of a photoreceptor drum, wherein the shaft member includes a spherical body of which at least one part is spherical and a rotating force transmission pin provided to protrude from the spherical body, the shaft member being swingably installed to the bearing member, the bearing member comprising: a concave section in which one section is opened and a bottom section on a side opposite to the one section has a curved surface along the spherical body, the concave section configured to receive the spherical body therein; and at least two swing grooves being grooves which are provided on a side surface of the concave section and into which end sections of the rotating force transmission pin are configured to be inserted, a concave section in which one section is opened and a bottom section on a side opposite to the one section has a curved surface along the spherical body, the concave section configured to receive the spherical body therein; and at least two swing grooves being grooves which are provided on a side surface of the concave section and into which end sections of the rotating force transmission pin are configured to be inserted, wherein the swing grooves at least include a parallel part which is parallel to the axis of the bearing member and a curved part curved toward the axis, wherein a bottom section side of the concave section when viewed from the opened side of the concave section is at a position which is closer to an axis side than the opened side of the concave section or at the same position as that of the axis side, on an arbitrarily adjacent cross section which is orthogonal to the direction of the axis of the spherical body receiving section, wherein the shaft member is prevented from being removed from the bearing member as the rotating force transmission pin of the shaft member is hooked to the curved part of the swing groove of the bearing member. <EOS>