| CPC A61B 5/0088 (2013.01) | 7 Claims | 

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               1. An optical dental caries diagnostic device comprising: 
            a body unit; 
                a light-emitting member located in front of the body unit in one direction along a longitudinal direction, the light-emitting member being configured to radiate visible light; and 
                a power supply unit electrically connected to the light-emitting member, the power supply unit extending through the body unit and then being exposed at a rear of the body unit, 
                wherein a filter unit detachably coupled to the light-emitting member is provided in front of the light-emitting member in the one direction, and 
                wherein the body unit comprises: 
              a first body having a first sealed surface provided at an end of a first side of the first body, the first body having a hollow cylindrical shape; 
                  a second body having a smaller inner diameter than an inner diameter of the first body, the second body being formed in a cylindrical shape having two open opposite ends and an empty interior; 
                  a cylindrical connection member having an outer side surface disposed in contact with an inner side surface of a second side of the first body and an inner side surface located at an outer side surface of the second body; and 
                  a control member located in an inner space of the first side of the first body, the control member being configured to control turning of the light-emitting member. 
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