yes, he needs to get a Hong Kong visa, the requirements are:
1. Passport/travel document with blank pages and a validity of at least 6 months.
2. One completed Hong Kong visa application form affixed with one passport-sized photo (ID 1003A)
3. Photocopy of proof of the applicant's financial standing, e.g. bank statements, savings accounts passbooks, tax receipts, etc. and proof of employment (if any), e.g. company leave letter, salary slips, etc.
4. Photocopy of proof of transportation arrangement, e.g. flight itinerary
5. Photocopy of proof of the proposed leisure visit to Hong Kong, e.g. receipt of joining a package tour to Hong Kong, itinerary, etc. (for leisure visit only)