本務 is read as ほんむ (hommu) and means duty.
ほんむ
hommu
にほんけいえいざいむけんきゅうがっかい
Japan Finance Association
ほんと
proper
ほんとに
really
ほんせい
true character
ほんぶ
headquarters
ほんばん
production environment
ほんのう
instinct
ほんじょうし
keynote (esp. shamisen)
ほんかいぎ
plenary session
ほんかく
original method
ほんかくか
regularization
ほんけん
this matter