An inverted microscope comprising: a stage which is adapted to place a specimen thereon; a light source unit which has a light source for irradiating the specimen on the stage with light; an objective lens which is adapted to focus observation light incident to the objective lens from the specimen on the stage; an ocular for observing the specimen; a body unit which holds at least the objective lens and the ocular; a condenser which is provided on an optical axis of the objective lens; a condenser holding unit which holds the condenser; a condenser moving mechanism which movably supports the condenser holding unit and is adapted to move the condenser holding unit along the optical axis; a transmission mechanism (141, 142, 151, 20, 21) which is adapted to transmit power for moving the condenser to the condenser moving mechanism; an input unit which is provided above the condenser holding unit and is adapted to input the power to the transmission mechanism; a support column of which one end is connected to the body unit and which extends in a direction substantially parallel to the optical axis; and an illumination support portion which extends from the other end of the support column in a direction substantially perpendicular to the extension direction of the support column, holds the light source unit, and is adapted to irradiate the condenser with light from the light source unit from above, wherein the input unit is rotatable about a rotary shaft and inputs the power in response to a rotation about the rotary shaft to move the condenser holding unit along the optical axis, the input unit is provided on the illumination support portion, the input unit and the ocular are provided on the same side with respect to a plane passing the optical axis and being parallel to the rotary shaft, wherein the transmission mechanism includes a timing belt which transmits the power in response to the operation of the input unit to the condenser moving mechanism, and wherein the timing belt is provided inside the support column and the illumination support portion. a stage which is adapted to place a specimen thereon; a light source unit which has a light source for irradiating the specimen on the stage with light; an objective lens which is adapted to focus observation light incident to the objective lens from the specimen on the stage; an ocular for observing the specimen; a body unit which holds at least the objective lens and the ocular; a condenser which is provided on an optical axis of the objective lens; a condenser holding unit which holds the condenser; a condenser moving mechanism which movably supports the condenser holding unit and is adapted to move the condenser holding unit along the optical axis; a transmission mechanism (141, 142, 151, 20, 21) which is adapted to transmit power for moving the condenser to the condenser moving mechanism; an input unit which is provided above the condenser holding unit and is adapted to input the power to the transmission mechanism; a support column of which one end is connected to the body unit and which extends in a direction substantially parallel to the optical axis; and an illumination support portion which extends from the other end of the support column in a direction substantially perpendicular to the extension direction of the support column, holds the light source unit, and is adapted to irradiate the condenser with light from the light source unit from above, wherein the input unit is rotatable about a rotary shaft and inputs the power in response to a rotation about the rotary shaft to move the condenser holding unit along the optical axis, the input unit is provided on the illumination support portion, the input unit and the ocular are provided on the same side with respect to a plane passing the optical axis and being parallel to the rotary shaft, wherein the transmission mechanism includes a timing belt which transmits the power in response to the operation of the input unit to the condenser moving mechanism, and wherein the timing belt is provided inside the support column and the illumination support portion.