A drainage member connected to a vehicle air conditioner's drain outlet, through which condensed water condensed by a cooling heat exchanger in a casing is drained out of the casing, and inserted into a through hole of a vehicle cabin wall, which separates inside of a vehicle cabin from outside of the vehicle cabin, in order to drain the condensed water into the outside of the vehicle cabin, the drainage member comprising: a drainpipe made of an elastic material; an engaging bevel which forms an integral part of the drainpipe so as to protrude radially outward from an outer periphery of the drainpipe with respect to a circumferential edge of the through hole, and which is engaged with the circumferential edge of the through hole from outside of the vehicle cabin wall; and three engaging stops (23, 24, 25) which form an integral part of the drainpipe so as to protrude radially outward from the outer periphery of the drainpipe with respect to the circumferential edge of the through hole, and which are engaged with the circumferential edge of the through hole from inside of the vehicle cabin wall, wherein the engaging bevel covers the entire outer periphery of the drainpipe, the engaging bevel has a side surface which faces toward the engaging stops (23, 24, 25) which defines a first sloped surface that slopes such that the closer to a radially outer edge of the drainpipe, the closer to the engaging stops (23, 24, 25) the first sloped surface is, the three engaging stops (23, 24, 25) are spaced apart from one another approximately 90 degrees in a circumferential direction of the drainpipe the engaging stops (23, 24, 25) have a side surface which faces away from the engaging bevel and which defines a second sloped surface that slopes such that the closer to a radially outer edge of the drainpipe, the closer to the engaging bevel the second sloped surface is, and the engaging stop (23, 24, 25) covers discontinuous areas in a circumferential direction of the drainpipe and the sum of the discontinuous areas covered by the engaging stop (23, 24, 25) is smaller than an area covered by the engaging bevel. a drainpipe made of an elastic material; an engaging bevel which forms an integral part of the drainpipe so as to protrude radially outward from an outer periphery of the drainpipe with respect to a circumferential edge of the through hole, and which is engaged with the circumferential edge of the through hole from outside of the vehicle cabin wall; and three engaging stops (23, 24, 25) which form an integral part of the drainpipe so as to protrude radially outward from the outer periphery of the drainpipe with respect to the circumferential edge of the through hole, and which are engaged with the circumferential edge of the through hole from inside of the vehicle cabin wall, wherein the engaging bevel covers the entire outer periphery of the drainpipe, the engaging bevel has a side surface which faces toward the engaging stops (23, 24, 25) which defines a first sloped surface that slopes such that the closer to a radially outer edge of the drainpipe, the closer to the engaging stops (23, 24, 25) the first sloped surface is, the three engaging stops (23, 24, 25) are spaced apart from one another approximately 90 degrees in a circumferential direction of the drainpipe the engaging stops (23, 24, 25) have a side surface which faces away from the engaging bevel and which defines a second sloped surface that slopes such that the closer to a radially outer edge of the drainpipe, the closer to the engaging bevel the second sloped surface is, and the engaging stop (23, 24, 25) covers discontinuous areas in a circumferential direction of the drainpipe and the sum of the discontinuous areas covered by the engaging stop (23, 24, 25) is smaller than an area covered by the engaging bevel.