This study examined the effects of parent participation in anti-bias educational activities on non-disabled children"s attitudes toward disabilities, along with age differences and interaction effects between age and the intervention. The subjects in the experimental group were 17 four-year-olds and 17 five-year-olds, drawn from an inclusive child care center in a D city. The control group consisted of 17 four-year-olds and 14 five-year-olds from another inclusive child care center located in the same city. The results indicated that the anti-bias educational activities utilizing parent participation, which illuminated that the children with disabilities have had similar experiences and desires with those without disabilities as well as unique characteristics and needs, significantly improved the non-disabled children"s attitudes toward disability in the experimental group, compared to those of the control group. There were statistically significant differences between the 2 age groups in sharing activity and problem solving, and significant interaction effects between age and the intervention in prosocial behaviors.