You have received a lot on HR.
For Administration includes:
Housekeeping
Security
Maintenance of Office Equipment
Annual Maintenance Contract
Vendor Management (Negotiation, preparing contract/AMCs etc.)
Canteen/Pantry Management
Garden Maintenance
Transport Arrangement
Traveling Arrangement (Road/Rail/Air)
Pest Control
Tel/Mobile/Leased Line, etc.
Arranging get-togethers/picnics/parties, etc.
Liaisoning with Govt/Semi-Govt authorities
Procurement of Stationery/Printing
Renovations of office, etc.
Asset Management/Record
AND other misc. job related to staff administration
Apart from the above, it changes according to the company.