<p>Different platform businesses create online structures that enable a wide range of work styles, including a flexible work style. Therefore, the changes created by platform work conditions are considered to improve the traditional labor market’s gender inequality problem; the consequences of platform economy growth warrant close attention. Although many studies have examined online platforms issues, how online platform diffusion affects the labor market remains unclear. This study considered gender inequity associated with platform work in Japan. We specifically focused on the impact of online platforms on labor and addressed whether the rise of the platform economy can weaken gender wage gaps in the online labor market. We conducted an empirical analysis to identify factors that possibly affect gender inequity in Japan’s online labor market. Using survey data on platform workers in Japan, we estimated the Mincer-type wage function, examined the existence of a gender wage gap in platform work, and explored the impact of having other employment aside from platform work. Moreover, we used the Blinder–Oaxaca decomposition to decompose the factors of the gender wage gap into discriminatory elements and other elements. The estimation results suggested a gender wage gap in platform work in annual income and influencing factors. However, for some platform workers, there was no gender wage gap in income from major clients. To better understand workers’ gender wage gap, we also analyzed the gender wage gap for independent contractors.</p>