An Australian man is being interviewed by police after his girlfriend plunged to her death from an apartment building in the seaside resort of Pattaya, Thailand.

The unnamed man was taken into custody after the incident early yesterday morning at Mint Mansion in Tambon Nong Plue, Bang Lamung district, The Nation newspaper reported.

Wilawal Poolsukserm, 28, fell from the fifth floor of the apartment at 2.30am on Monday (local time) and died on her way to the Pattaya Memorial Hospital.

The 28-year-old woman reportedly died on her way to hospital. (The Nation) (The Nation)

The woman reportedly fell from the fifth floor of Mint Mansion. (Agoda) (Agoda)

When rescuers arrived at the scene they saw the Australian man holding the woman's hand and crying, The Nation reported.

Police are interviewing the Australian in a bid to determine whether or not Wilawal's death was a suicide. His name has not been released.

The Australian Department of Foreign Affairs and Trade (DFAT) said it was aware of the reports and "stands ready to offer consular assistance should he request it".