A blood processing filter for removing undesirable components from liquid containing a blood component or blood, the filter comprising: a sheet-shaped filter element; and a container that includes an inlet-side container element and an outlet-side container element that are disposed to clamp the filter element, and has an internal space separated by the filter element into an inlet space and an outlet space, the blood processing filter being characterized in that: the filter element includes a filtering surface on a side of the inlet space, a filtering surface on a side of the outlet space, and an end surface along peripheries of the pair of filtering surfaces (2a, 2b), the inlet-side container element and the outlet-side container element are provided with a gripper, and the gripper clamps and compresses an outer edge portion of the pair of filtering surfaces (2a,2b), and is caused to adhere to the end surface with melt resin, an outer edge portion including the end surfaces (4e, 5e) of the inlet-side container element and the outlet-side container element is provided with an inlet-side contact portion and an outlet-side contact portion, respectively, which are brought into contact with each other, the gripper includes an inlet-side gripper and an outlet-side gripper that hold the outer edge portion of the filter element, at the inner edges of the inlet-side contact portion and the outlet-side contact portion, a resin flow path is a tubular cavity formed of the inlet-side gripper, the outlet-side gripper, the inlet-side contact portion, and the outlet-side contact portion, and the end surface of the filter element, the resin flow path surrounds the end surface of the filter element and is provided with the melt resin, and at the gripper, the filter element is not melted. a sheet-shaped filter element; and a container that includes an inlet-side container element and an outlet-side container element that are disposed to clamp the filter element, and has an internal space separated by the filter element into an inlet space and an outlet space, the blood processing filter being characterized in that: the filter element includes a filtering surface on a side of the inlet space, a filtering surface on a side of the outlet space, and an end surface along peripheries of the pair of filtering surfaces (2a, 2b), the inlet-side container element and the outlet-side container element are provided with a gripper, and the gripper clamps and compresses an outer edge portion of the pair of filtering surfaces (2a,2b), and is caused to adhere to the end surface with melt resin, an outer edge portion including the end surfaces (4e, 5e) of the inlet-side container element and the outlet-side container element is provided with an inlet-side contact portion and an outlet-side contact portion, respectively, which are brought into contact with each other, the gripper includes an inlet-side gripper and an outlet-side gripper that hold the outer edge portion of the filter element, at the inner edges of the inlet-side contact portion and the outlet-side contact portion, a resin flow path is a tubular cavity formed of the inlet-side gripper, the outlet-side gripper, the inlet-side contact portion, and the outlet-side contact portion, and the end surface of the filter element, the resin flow path surrounds the end surface of the filter element and is provided with the melt resin, and at the gripper, the filter element is not melted. the filter element includes a filtering surface on a side of the inlet space, a filtering surface on a side of the outlet space, and an end surface along peripheries of the pair of filtering surfaces (2a, 2b), the inlet-side container element and the outlet-side container element are provided with a gripper, and the gripper clamps and compresses an outer edge portion of the pair of filtering surfaces (2a,2b), and is caused to adhere to the end surface with melt resin, an outer edge portion including the end surfaces (4e, 5e) of the inlet-side container element and the outlet-side container element is provided with an inlet-side contact portion and an outlet-side contact portion, respectively, which are brought into contact with each other, the gripper includes an inlet-side gripper and an outlet-side gripper that hold the outer edge portion of the filter element, at the inner edges of the inlet-side contact portion and the outlet-side contact portion, a resin flow path is a tubular cavity formed of the inlet-side gripper, the outlet-side gripper, the inlet-side contact portion, and the outlet-side contact portion, and the end surface of the filter element, the resin flow path surrounds the end surface of the filter element and is provided with the melt resin, and at the gripper, the filter element is not melted.