A door mirror device comprising: a first structural body (12, 14) that configures a casing covering a mirror provided at a vehicle door, and that is provided with a first facing portion and a second facing portion; a second structural body that configures the casing, and that is provided with a first disposition portion disposed at a back side of the first facing portion so as to face the first facing portion in a first direction and a second disposition portion disposed at a back side of the second facing portion so as to face the second facing portion in a second direction; a fixing portion that is provided at the first structural body (12, 14); and a fixed-to portion that is provided at the second structural body and that is fixed to the fixing portion; characterized in that an abutting portion is provided at the first structural body (12, 14) and is disposed at a second direction side of the fixing portion, the abutting portion is configured such that: the first disposition portion is separated from the first facing portion on the second direction side and the second disposition portion is separated from the second facing portion on a first direction side when the fixed-to portion is abutted to the abutting portion, and the first disposition portion is engaged with the back face of first facing portion and the second disposition portion is engaged with the back face of second facing portion when the fixed-to portion is moved from the abutting portion to the fixing portion and is abutted to the fixing portion. a first structural body (12, 14) that configures a casing covering a mirror provided at a vehicle door, and that is provided with a first facing portion and a second facing portion; a second structural body that configures the casing, and that is provided with a first disposition portion disposed at a back side of the first facing portion so as to face the first facing portion in a first direction and a second disposition portion disposed at a back side of the second facing portion so as to face the second facing portion in a second direction; a fixing portion that is provided at the first structural body (12, 14); and a fixed-to portion that is provided at the second structural body and that is fixed to the fixing portion; characterized in that an abutting portion is provided at the first structural body (12, 14) and is disposed at a second direction side of the fixing portion, the abutting portion is configured such that: the first disposition portion is separated from the first facing portion on the second direction side and the second disposition portion is separated from the second facing portion on a first direction side when the fixed-to portion is abutted to the abutting portion, and the first disposition portion is engaged with the back face of first facing portion and the second disposition portion is engaged with the back face of second facing portion when the fixed-to portion is moved from the abutting portion to the fixing portion and is abutted to the fixing portion. the first disposition portion is separated from the first facing portion on the second direction side and the second disposition portion is separated from the second facing portion on a first direction side when the fixed-to portion is abutted to the abutting portion, and the first disposition portion is engaged with the back face of first facing portion and the second disposition portion is engaged with the back face of second facing portion when the fixed-to portion is moved from the abutting portion to the fixing portion and is abutted to the fixing portion.