The robbery happened at about 4.45pm at a salon on Witchfield Hill in Shelf on Thursday, March 21.
The man entered the salon a threatened staff with a knife.
He made demands for money and fled with a box containing cash.
No one was injured in the incident but staff were left shaken.
A 20-year-old man was arrested on suspicion of the robbery.
He has been released while investigations continue.
Police have today released CCTV images of a man they would like to speak to in relation t the investigation.
Anyone with information on the robbery is asked to contact Calderdale CID on 101 or via the 101 live chat, quoting crime reference 13190147720.