An eyeball attachment tube (1, 8) that is temporarily attached to an outer membrane of an eyeball in ophthalmic surgery for communication between an inside and an outside of the eyeball, the eyeball attachment tube (1, 8) comprising: a tubular portion (2, 9) formed in a tubular shape, the tubular portion (2, 9) configured to be in a state of puncturing the outer membrane when the eyeball attachment tube (1, 8) is attached to the outer membrane; and a large diameter portion (3, 10) disposed on a proximal end side of the tubular portion (2, 9), the large diameter portion (3, 10) having an outer diameter larger than an outer diameter of the tubular portion (2, 9), the large diameter portion (3, 10) configured to be exposed externally from the outer membrane when the eyeball attachment tube (1, 8) is attached to the outer membrane, wherein an end portion (31, 11), in a parallel direction to a center axis (L1, L5) of the tubular portion (2, 9), of the large diameter portion (3, 10) on the tubular portion (2, 9) side is shaped so as to have a height difference in the parallel direction between one end (31a, 11a) and another end (31b, 11b) in a direction perpendicular to the center axis (L1, L5) in a side view, an entirety of the end portion (31, 11) is formed as an inclined plane relative to the center axis (L1, L5), and an end portion (32, 12), of the large diameter portion (3, 10), on an opposite side to the end portion (31, 11) on the tubular portion (2, 9) side in the parallel direction is formed as a plane perpendicular to the center axis (L1, L5), wherein the large diameter portion (3, 10) includes a valve for inhibiting liquid from flowing out from an opening formed in the end portion (32, 12) on the opposite side, wherein the valve is a member having a slit formed in an elastic material so as to close a channel in the large diameter portion (3, 10). a tubular portion (2, 9) formed in a tubular shape, the tubular portion (2, 9) configured to be in a state of puncturing the outer membrane when the eyeball attachment tube (1, 8) is attached to the outer membrane; and a large diameter portion (3, 10) disposed on a proximal end side of the tubular portion (2, 9), the large diameter portion (3, 10) having an outer diameter larger than an outer diameter of the tubular portion (2, 9), the large diameter portion (3, 10) configured to be exposed externally from the outer membrane when the eyeball attachment tube (1, 8) is attached to the outer membrane, wherein an end portion (31, 11), in a parallel direction to a center axis (L1, L5) of the tubular portion (2, 9), of the large diameter portion (3, 10) on the tubular portion (2, 9) side is shaped so as to have a height difference in the parallel direction between one end (31a, 11a) and another end (31b, 11b) in a direction perpendicular to the center axis (L1, L5) in a side view, an entirety of the end portion (31, 11) is formed as an inclined plane relative to the center axis (L1, L5), and an end portion (32, 12), of the large diameter portion (3, 10), on an opposite side to the end portion (31, 11) on the tubular portion (2, 9) side in the parallel direction is formed as a plane perpendicular to the center axis (L1, L5), wherein the large diameter portion (3, 10) includes a valve for inhibiting liquid from flowing out from an opening formed in the end portion (32, 12) on the opposite side,