背面 is read as はいめん (haimen) and means rear.
はいめん
haimen
はいめんひこう
inverted flight
はいめんとび
Fosbury-back flop
めんこうふはい
flawless
めんじゅうふくはい
pretending to obey but secretly betraying (someone)
せおう
to carry on one's back
しょいなげ
seoi nage (judo)
せなか
back (of the body)
はいけい
backing
せびろ
business suit
せい
height
はいご
back
はいにん
breach of trust