The invention discloses a light modulartor with small emited
light beam distance and less light loss, an
optical module having the light modulator and an
image display apparatus.A light modulator (3) includes a substrate (301) providing an electro-optical effect and provided with first to third optical waveguides (302B,302G,302R), a first modulation section (300B) that modulates a
blue light (LB) flux passing through the first optical
waveguide (302B), a second modulation section (300G) that modulates a
green light flux (LG) passing through the second optical
waveguide (302G), and a third modulation section (300R) that modulates a
red light flux (LR) passing through the third optical
waveguide (302R), and L1<L2<L3 and S1>S2>S3 are satisfied, where L1 represents the length of the first modulation section (300B), S1 represents the distance between a first
reference line (DL1) and a first exit section (3026B), L2 represents the length of the second modulation section (300G), S2 represents the distance between a second
reference line (DL2)and a second exit section (3026R), L3 represents the length of the third modulation section (300R), and S3 represents the distance between a third
reference line (DL3)and a third exit section (3026R).