A camera module comprising: a housing comprising a through hole ; a lens module disposed in the through hole ; a connector penetrating the housing and extending to an outside from an inside of the housing ; a first substrate unit located inside the housing and having an image sensor mounted thereon; a second substrate unit disposed in the housing and connected to the connector ; and a flexible substrate electrically connecting a second substrate portion of the first substrate unit and a third substrate portion of the second substrate unit , wherein the flexible substrate is coupled to a lower surface of the second substrate portion of the first substrate unit and a side surface of the third substrate portion of the second substrate unit , wherein the first substrate unit includes a first substrate portion including a first connecting port , the first substrate portion being mounted at an upper surface with the image sensor , the first connecting port being disposed at the bottom surface of the first substrate portion , and the second substrate portion including a second connecting port coupled to the first connecting port , and wherein the second substrate unit includes the third substrate portion including a third connecting port connected to the second substrate portion through the flexible substrate and a fourth substrate portion including a fourth connecting port coupled to the third connecting port and connected to the connector , characterized in that the first substrate portion comprises a guide hole , and characterized in that the housing comprises a guide lug protruded inwardly and inserted into the guide hole to guide a coupling position of the first substrate portion . a housing comprising a through hole ; a lens module disposed in the through hole ; a connector penetrating the housing and extending to an outside from an inside of the housing ; a first substrate unit located inside the housing and having an image sensor mounted thereon; a second substrate unit disposed in the housing and connected to the connector ; and a flexible substrate electrically connecting a second substrate portion of the first substrate unit and a third substrate portion of the second substrate unit , wherein the flexible substrate is coupled to a lower surface of the second substrate portion of the first substrate unit and a side surface of the third substrate portion of the second substrate unit , wherein the first substrate unit includes a first substrate portion including a first connecting port , the first substrate portion being mounted at an upper surface with the image sensor , the first connecting port being disposed at the bottom surface of the first substrate portion , and the second substrate portion including a second connecting port coupled to the first connecting port , and wherein the second substrate unit includes the third substrate portion including a third connecting port connected to the second substrate portion through the flexible substrate and a fourth substrate portion including a fourth connecting port coupled to the third connecting port and connected to the connector , characterized in that the first substrate portion comprises a guide hole , and characterized in that the housing comprises a guide lug protruded inwardly and inserted into the guide hole to guide a coupling position of the first substrate portion . <EOS>