(EN) Provided is an underground irrigation device capable of uniformly supplying irrigation water to a plurality of underdrain pipes buried in a field and suppressing uneven rise in groundwater level. Irrigation water can be supplied into the field 11 through the plurality of underdrain pipes 10 by supplying the irrigation water to the plurality of underdrain pipes 10 which are branched from the main water supply pipe 2 that supplies the irrigation water and are buried in the field 11. A device for underground irrigation, which is connected between a main water supply pipe 2 and a plurality of underdrain pipes 10, stores irrigation water supplied from the main water supply pipe 2, and stores a plurality of the stored irrigation water at the same head pressure. This is a device for underground irrigation including a water distribution member 3 that can be supplied to the underdrain pipe 10.圃場に埋設された複数の暗渠管へのかんがい用水の供給を均一に行うことができ、地下水位の上昇ムラを抑制することが可能な地下かんがい用装置を提供する。かんがい用水を供給する主給水管２から分岐して圃場１１内に埋設される複数の暗渠管１０にかんがい用水を供給することにより、複数の暗渠管１０を通じて圃場１１内にかんがい用水を供給可能な地下かんがい用装置であって、主給水管２と複数の暗渠管１０との間に接続され、主給水管２から供給されるかんがい用水を貯留し、貯留したかんがい用水を同一の水頭圧で複数の暗渠管１０へ供給可能な配水部材３を備える地下かんがい用装置である。
