One woman who took part in the march on Sunday, Meng Phang, 59, shouted to onlookers, including stone-faced police officers, that “Hun Sen and his family are getting richer, but everyone else is getting poorer.”

Ms. Meng Phang’s participation also represented another crucial factor of the protests: the sustained financing of the movement. Ms. Meng Phang said she had donated about $1,000 to the protest movement from money she had saved while working in a factory in Japan.

Kem Sokha, one of the protest leaders, singled out contributions “from our people abroad” in a speech to protesters on Sunday evening. There are large Cambodian populations in Australia, France and the United States, among other countries.

The grievances among protesters on Sunday were varied. Sok Heng, a middle-aged carpenter, lamented the lack of justice in the country and mentioned the case of his brother-in-law, who he said was killed by a thief. The police asked for a bribe before agreeing to arrest the suspect, he said.

Touch Vandeth, 24, was one of thousands of garment workers on strike who demanded a doubling of the minimum wage to $160 a month, a sharp increase that would put wages well above those of Cambodia’s regional economic competitors, including Bangladesh, Myanmar and Vietnam. Ms. Touch Vandeth, who assembles Adidas footwear at a factory on the outskirts of Phnom Penh, said she had been unable to save much money on her current salary, $80 plus overtime.

Chay Soheaktra, one of the many Buddhist monks taking part in the demonstration, said he was angry that Mr. Hun Sen’s government had given a forestry concession to a Vietnamese company. Anti-Vietnamese talk has been a mainstay of the protest leaders, who portray Mr. Hun Sen as a puppet of Vietnam. (Mr. Hun Sen is Cambodian but came to power with the aid of an invading Vietnamese Army that pushed the Khmer Rouge from power in 1979.)