A digital microscope comprising: a bright field lighting section (17, 21, 23a) that supplies bright field light to a sample; a dark field lighting section (16, 18) that supplies dark field light to the sample; a magnifying optical system that concentrates light reflected or scattered on the sample; an imaging sensor section that photoelectrically converts light made incident through the magnifying optical system to pick up an image of the sample; a displaying section that displays the image picked up by the imaging sensor section, an operating section for designating a mixture ratio of the bright field light and the dark field light; and a mixture ratio changing unit that changes the mixture ratio of the bright field light and the dark field light according to operation in the operating section; characterized in that the mixture ratio changing unit includes: a first optical fiber bundle for supplying light to the bright field lighting section; a second optical fiber bundle for supplying light to the dark field lighting section; and a third optical fiber bundle for causing light from a light source to enter the first optical fiber bundle and the second optical fiber bundle, and wherein a light entry end of the first optical fiber bundle and a light entry end of the second optical fiber bundle are arranged adjacent to each other to face in a same direction, a light exit end of the third optical fiber bundle is arranged to be opposed to both of the light entry ends, and the mixture ratio changing unit is suitable to move the light exit end according to an operation amount in the operating section while keeping a state in which the light exit end and both of the light entry ends are opposed to each other. a bright field lighting section (17, 21, 23a) that supplies bright field light to a sample; a dark field lighting section (16, 18) that supplies dark field light to the sample; a magnifying optical system that concentrates light reflected or scattered on the sample; an imaging sensor section that photoelectrically converts light made incident through the magnifying optical system to pick up an image of the sample; a displaying section that displays the image picked up by the imaging sensor section, an operating section for designating a mixture ratio of the bright field light and the dark field light; and a mixture ratio changing unit that changes the mixture ratio of the bright field light and the dark field light according to operation in the operating section; characterized in that the mixture ratio changing unit includes: a first optical fiber bundle for supplying light to the bright field lighting section; a second optical fiber bundle for supplying light to the dark field lighting section; and a third optical fiber bundle for causing light from a light source to enter the first optical fiber bundle and the second optical fiber bundle, and wherein a light entry end of the first optical fiber bundle and a light entry end of the second optical fiber bundle are arranged adjacent to each other to face in a same direction, a light exit end of the third optical fiber bundle is arranged to be opposed to both of the light entry ends, and the mixture ratio changing unit is suitable to move the light exit end according to an operation amount in the operating section while keeping a state in which the light exit end and both of the light entry ends are opposed to each other. a first optical fiber bundle for supplying light to the bright field lighting section; a second optical fiber bundle for supplying light to the dark field lighting section; and a third optical fiber bundle for causing light from a light source to enter the first optical fiber bundle and the second optical fiber bundle, and wherein a light entry end of the first optical fiber bundle and a light entry end of the second optical fiber bundle are arranged adjacent to each other to face in a same direction, a light exit end of the third optical fiber bundle is arranged to be opposed to both of the light entry ends, and the mixture ratio changing unit is suitable to move the light exit end according to an operation amount in the operating section while keeping a state in which the light exit end and both of the light entry ends are opposed to each other.