An endoscopic mucous membrane lifting instrument, comprising: a cap configured to be mounted at a distal end of an insertion portion of an endoscopic device along a central line; a first wire disposed at the cap; a second wire disposed at the cap; and a wire-manipulating portion configured to independently operate the first wire and the second wire, characterized in that the cap further includes a tubular portion for receiving the distal end of the insertion portion, the tubular portion comprising a first pair of through holes and a second pair of through holes which are spaced apart from each other and parallel with the central line; a projection portion formed to extend from a distal end of the cap to a distal side; wherein the projection portion includes: a first projection portion configured to extend from the distal end of the cap to the distal side, wherein the first projection portion is formed to gradually narrow toward the distal side; and a second projection portion disposed at a position facing the first projection portion in a radial direction of the insertion portion and configured to extend from the distal end of the cap to the distal side, wherein the second projection portion is formed to gradually narrow toward the distal side; wherein the first wire is configured to be capable of protruding from the first pair of through holes toward a direction more distal than the insertion portion and in a direction approaching an extension line of the central line; wherein the second wire is configured to be capable of protruding from the second pair of through holes toward a direction more distal than the insertion portion and in a direction parallel to the central line; and wherein the first pair of through holes and the second pair of through holes are disposed at a position between the first projection portion and the second projection portion in a radial direction, and the first pair of through holes is disposed between the second pair of through holes. a cap configured to be mounted at a distal end of an insertion portion of an endoscopic device along a central line; a first wire disposed at the cap; a second wire disposed at the cap; and a wire-manipulating portion configured to independently operate the first wire and the second wire, characterized in that the cap further includes a tubular portion for receiving the distal end of the insertion portion, the tubular portion comprising a first pair of through holes and a second pair of through holes which are spaced apart from each other and parallel with the central line; a projection portion formed to extend from a distal end of the cap to a distal side; wherein the projection portion includes: a first projection portion configured to extend from the distal end of the cap to the distal side, wherein the first projection portion is formed to gradually narrow toward the distal side; and a second projection portion disposed at a position facing the first projection portion in a radial direction of the insertion portion and configured to extend from the distal end of the cap to the distal side, wherein the second projection portion is formed to gradually narrow toward the distal side; wherein the first wire is configured to be capable of protruding from the first pair of through holes toward a direction more distal than the insertion portion and in a direction approaching an extension line of the central line; wherein the second wire is configured to be capable of protruding from the second pair of through holes toward a direction more distal than the insertion portion and in a direction parallel to the central line; and wherein the first pair of through holes and the second pair of through holes are disposed at a position between the first projection portion and the second projection portion in a radial direction, and the first pair of through holes is disposed between the second pair of through holes. a tubular portion for receiving the distal end of the insertion portion, the tubular portion comprising a first pair of through holes and a second pair of through holes which are spaced apart from each other and parallel with the central line; a projection portion formed to extend from a distal end of the cap to a distal side; wherein the projection portion includes: a first projection portion configured to extend from the distal end of the cap to the distal side, wherein the first projection portion is formed to gradually narrow toward the distal side; and a second projection portion disposed at a position facing the first projection portion in a radial direction of the insertion portion and configured to extend from the distal end of the cap to the distal side, wherein the second projection portion is formed to gradually narrow toward the distal side; wherein the first wire is configured to be capable of protruding from the first pair of through holes toward a direction more distal than the insertion portion and in a direction approaching an extension line of the central line; wherein the second wire is configured to be capable of protruding from the second pair of through holes toward a direction more distal than the insertion portion and in a direction parallel to the central line; and wherein the first pair of through holes and the second pair of through holes are disposed at a position between the first projection portion and the second projection portion in a radial direction, and the first pair of through holes is disposed between the second pair of through holes.