A light emitting module comprising: a light source unit comprising a board and a light emitting device disposed on the board; a body comprising a lower portion in which the board is disposed, a wall portion disposed on the lower portion and surrounding the board, and an upper portion disposed on the wall portion; an optical member disposed on the light source unit and transmitting light from the light emitting device; and an adhesive member disposed between the wall portion of the body and the optical member, wherein the upper portion of the body is disposed on a top surface of the wall portion, wherein the light emitting device is configured to emit UV rays, wherein the top surface of the wall portion comprises an inner portion, a middle portion, and an outer portion, wherein the upper portion of the body comprises a first upper portion disposed on the outer portion of the top surface of the wall portion and a second upper portion disposed on the inner portion of the top surface of the wall portion, wherein a height of the first upper portion is greater than that of the second upper portion, wherein the adhesive member is disposed between the first upper portion and the second upper portion and on the middle portion of the top surface of the wall portion, wherein the optical member is surrounded by the first upper portion and disposed on a top surface of the second upper portion and the adhesive member, and wherein the optical member comprises a top surface, a bottom surface and a side surface characterised in that the bottom surface of the optical member comes in contact with the second upper portion of the body. a light source unit comprising a board and a light emitting device disposed on the board; a body comprising a lower portion in which the board is disposed, a wall portion disposed on the lower portion and surrounding the board, and an upper portion disposed on the wall portion; an optical member disposed on the light source unit and transmitting light from the light emitting device; and an adhesive member disposed between the wall portion of the body and the optical member, wherein the upper portion of the body is disposed on a top surface of the wall portion, wherein the light emitting device is configured to emit UV rays, wherein the top surface of the wall portion comprises an inner portion, a middle portion, and an outer portion, wherein the upper portion of the body comprises a first upper portion disposed on the outer portion of the top surface of the wall portion and a second upper portion disposed on the inner portion of the top surface of the wall portion, wherein a height of the first upper portion is greater than that of the second upper portion, wherein the adhesive member is disposed between the first upper portion and the second upper portion and on the middle portion of the top surface of the wall portion, wherein the optical member is surrounded by the first upper portion and disposed on a top surface of the second upper portion and the adhesive member, and wherein the optical member comprises a top surface, a bottom surface and a side surface characterised in that the bottom surface of the optical member comes in contact with the second upper portion of the body.