Police are appealing for witnesses following an incident at The Jubilee Auction Rooms in Pewsey.
The owner of the auction rooms returned to the office just before 1pm on Friday to find an intruder inside.
The intruder pushed his way past the woman, who tried to stop him from taking her handbag and money.
After a short struggle the man was seen making off in a vehicle at speed along Marlborough Road in Pewsey.
Officers are particularly keen to speak to witnesses who may have seen an old style red Volkswagen Golf in the area at that time with a male driver and female passenger.
The car was later found abandoned a short way away in All Cannings.
Anyone with any information can call Wiltshire Police on 0845 4087000 or Crimestoppers on 0800 555111.
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