A promise of free gifts for the first 50 customers drew in the crowds to the new store, situated on the site of the former Beales shop in The Forum.
Meanwhile, ladies of the Cantatrice choir kept the crowds entertained with Christmas carols as they waited for the grand opening.
Horsham District Council chairman Christian Mitchell conducted the official opening ceremony by cutting a ribbon at the front door of the store.
The store itself has more than 20,000 home furnishing and garden products on offer to customers, and also offers a made to measure bespoke service.
There is also a Pausa Cafe in-store offering, tea, coffee, cold drinks, sweet treats and lunches.