The value of product, which a consumer feels when he/she makes a decision to buy, changes depending on the options simultaneously presented to him/her. As a representative example, the attraction effect is well known. This effect means that choice probability of the target increases when an option which is asymmetrically dominated to the target, called decoy, is added in his/her alternatives. Although the previous studies clarified the existence of the attraction effect, the impact of the difference of decoy's attributes value on its effect is not clear. Thus, this study attempted to clarify how the difference of them influences the attributes which consumer place significance on and the sequent attraction effect through a questionnaire survey.