MOLDED OPTICAL BODY

The purpose of the present invention is to provide a molded article for optical applications, which has little deterioration in moisture-proof performance and high shape stability even when used in a high-temperature, high-humidity environment. The optical molded body according to the present invention has an equilibrium water absorption rate of 0.5% or more in a 60 DEG C, 90% RH environment, and satisfies m100/m24 > = 0.6, where m24 is the average moisture absorption rate per unit area for 0-24 hours in a 60 DEG C, 90% RH environment test, and m100 is the average moisture absorption rate per unit area for 0-100 hours in a 60 DEG C, 90% RH environment test. 本发明的目的在于提供即使在高温高湿环境中使用，防湿性能的劣化也少而且具有高形状稳定性的面向光学用途的成型体。本发明的光学用成型体，其中，所述光学用成型体在60℃、90％RH环境中的平衡吸水率是0.5％以上，将60℃、90％RH环境试验中的0小时～24小时的每单位面积的平均吸湿速度设为m_24，并且将60℃、90％RH环境试验中的0小时～100小时的每单位面积的平均吸湿速度设为m_100时，m_100/m_24≥0.6。