advisory committee; advisory council; advisory panel
A formal committee or council that provides expert advice or recommendations to an organization or government body.
The government sought the opinion of the advisory committee on the new policy.
審議会 is a deliberative council that discusses and decides on matters, while 諮問委員会 is specifically an advisory body that provides recommendations without decision-making power.
Compound of 諮問 (しもん, 'consultation' or 'inquiry') and 委員会 (いいんかい, 'committee').