This study considers how invisibility under the law can lead to stigmatisation. It examines how legal silence affects the stigmatisation process and the identity of male sex workers in Japan. Since male sex work is currently not recognised under Japanese law, male sex workers are not subject to control, regulation, punishment or protection. However, the number of male sex workers in Japan is increasing. Many studies have noted that male sex workers may experience double stigmatisation – referring to the stigma associated with homosexuality and the stigma associated with commercial sex. Male sex workers in Japan, however, may face an additional stigma caused by the fact that the law essentially ignores their existence. This paper draws on fieldwork interviews to show how the silence of the law can exacerbate the marginalisation and disempowerment of a vulnerable social group.