A mirror device for a vehicle comprising: a support member which is housed and fixed within a housing supported on a vehicle, a mirror disposed in an opening of the housing, the mirror being held by a mirror holder made of a synthetic resin, a joint having a spherical portion in an extremity part thereof, the joint being projectingly provided on the support member, a hollow hemispherical fitting and supporting part configured to have the spherical portion fitted thereinto, the fitting and supporting part being provided on the mirror holder, a ring-shaped spring for maintaining the fitted state of the spherical portion within the fitting and supporting part, the spring being fitted around an outer periphery of the fitting and supporting part, and engagement parts that engage with the spring so as to prevent the spring from disengaging from the fitting and supporting part, the engagement parts being formed integrally with the mirror holder at a plurality of locations around the fitting and supporting part while being capable of flexing toward the radially outward direction so as to allow the spring to be fitted onto the fitting and supporting part, characterized in that the fitting and supporting part is formed by annularly aligning a plurality of side wall parts having an inner face with an arc-shaped vertical section so as to project from the mirror holder while forming slits therebetween, and the engagement parts are disposed outside the fitting and supporting part at positions corresponding to the slits of the fitting and supporting part, whereas the engagement parts are radially spaced from the fitting and supporting part. a support member which is housed and fixed within a housing supported on a vehicle, a mirror disposed in an opening of the housing, the mirror being held by a mirror holder made of a synthetic resin, a joint having a spherical portion in an extremity part thereof, the joint being projectingly provided on the support member, a hollow hemispherical fitting and supporting part configured to have the spherical portion fitted thereinto, the fitting and supporting part being provided on the mirror holder, a ring-shaped spring for maintaining the fitted state of the spherical portion within the fitting and supporting part, the spring being fitted around an outer periphery of the fitting and supporting part, and engagement parts that engage with the spring so as to prevent the spring from disengaging from the fitting and supporting part, the engagement parts being formed integrally with the mirror holder at a plurality of locations around the fitting and supporting part while being capable of flexing toward the radially outward direction so as to allow the spring to be fitted onto the fitting and supporting part, characterized in that the fitting and supporting part is formed by annularly aligning a plurality of side wall parts having an inner face with an arc-shaped vertical section so as to project from the mirror holder while forming slits therebetween, and the engagement parts are disposed outside the fitting and supporting part at positions corresponding to the slits of the fitting and supporting part, whereas the engagement parts are radially spaced from the fitting and supporting part.