Image display device and projector

The invention seeks to provide a compact and bright image display device using a tilt-mirror device and a projector using the image display device. An image display device includes a first color-ray light-source 10 for supplying a G-ray, a second color-ray light-source 20 for supplying a R-ray or B-ray, and a tilt-mirror device 30 having a plurality of movable mirror elements 31 the position thereof being alternatively switchable the between a first reflection position and a second reflection position; and the first color-ray light-source 10 is arranged so that the G-ray is reflected in a predetermined direction L1 when the movable mirror elements 31 are located in the first reflection position, while the G-ray is reflected in a direction L2 when the movable mirror elements 31 are located in the second reflection position; and the second color-ray light-source 20 is arranged so that the R-ray or B-ray is reflected in the predetermined direction L1 when the movable mirror elements 31 are located in the second reflection position, while the R-ray or B-ray is reflected in a direction L3 when the movable mirror elements 31 are located in the first reflection position.