Decorated characters in comic, which we call “comic ideophone” (or “描き文字” in Japanese) describe a sound, a state, an inner feeling of the object etc. in comic. In this research, we will experimentally investigate the effects of comic ideophones for viewers of the picture including the comic ideophone. We focused on comic ideophones which describe shape, texture and hardness of the object and will create some comic ideophones which have a different shape of the contour and a word sound. In the experiment, we will examine 5 different conditions to find out factors which can be correlated to the impression of ideophones.