An automated teller machine comprising a medium conveyance path switching device, said medium conveyance path switching device, comprising: a support unit located at a branch point of a conveyance path at which a conveying direction for a medium converges from three directions; a gate assembly including a plurality of gates to guide the medium to different conveyance paths at the branch point; and a rotation mechanism configured to selectively rotate the plurality of gates, characterized in that the support unit includes: a first support piece having a first through-hole portion; a second support piece having a second through-hole portion and disposed on one side of the first support piece; a third support piece having a third through-hole portion and disposed on the other side of the first support piece; a first bending connection part pivotably connecting one end of the first support piece and the second support piece; and a second bending connection part pivotably connecting the other end of the first support piece and the third support piece, and wherein the first bending connection part has different thicknesses in a direction connecting the one end of the first support piece and the second support piece, and the second bending connection part has different thicknesses in a direction connecting the other end of the first support piece and the third support piece. a support unit located at a branch point of a conveyance path at which a conveying direction for a medium converges from three directions; a gate assembly including a plurality of gates to guide the medium to different conveyance paths at the branch point; and a rotation mechanism configured to selectively rotate the plurality of gates, characterized in that the support unit includes: a first support piece having a first through-hole portion; a second support piece having a second through-hole portion and disposed on one side of the first support piece; a third support piece having a third through-hole portion and disposed on the other side of the first support piece; a first bending connection part pivotably connecting one end of the first support piece and the second support piece; and a second bending connection part pivotably connecting the other end of the first support piece and the third support piece, and wherein the first bending connection part has different thicknesses in a direction connecting the one end of the first support piece and the second support piece, and the second bending connection part has different thicknesses in a direction connecting the other end of the first support piece and the third support piece. a first support piece having a first through-hole portion; a second support piece having a second through-hole portion and disposed on one side of the first support piece; a third support piece having a third through-hole portion and disposed on the other side of the first support piece; a first bending connection part pivotably connecting one end of the first support piece and the second support piece; and a second bending connection part pivotably connecting the other end of the first support piece and the third support piece, and wherein the first bending connection part has different thicknesses in a direction connecting the one end of the first support piece and the second support piece, and the second bending connection part has different thicknesses in a direction connecting the other end of the first support piece and the third support piece.