支部 is read as しぶ (shibu) and means branch.
しぶ
shibu
したくべや
dressing room
ぞうしぶ
Samyutta Nikaya (Buddhist sutra)
そうしぶ
election campaign office
かりょくしえんぶたい
fire support element
しじ
propping up
ししゅつ
expenditure
しきょく
branch office
してん
しはい
government
ししゃ
したく
preparation
しはらい
payment