A steering column device comprising: a steering shaft to which a steering wheel is fixed; and a steering column configured to support the steering shaft such that the steering shaft is rotatable, wherein: the steering column includes a housing opened in an axial direction of the steering column, a cover configured to close an opening of the housing, and a sealing member configured to provide sealing between the housing and the cover; a first side in the axial direction of the steering column is a side where the housing is located relative to the cover, and a second side in the axial direction of the steering column is a side where the cover is located relative to the housing; characterized in that the housing includes an inclined portion having an inclined surface with an inside diameter increasing from the first side to the second side, the inclined surface contacting the sealing member from the first side; the cover includes a facing portion having a facing surface contacting the sealing member from the second side, and an insertion portion having an outer peripheral surface contacting the sealing member from an inner peripheral side; the sealing member is accommodated in an accommodation space defined by the inclined surface, the facing surface, and the outer peripheral surface; and an escape space continuous with the accommodation space is provided between the housing and the cover, the escape space being located closer to the first side than the inclined surface is. a steering shaft to which a steering wheel is fixed; and a steering column configured to support the steering shaft such that the steering shaft is rotatable, wherein: the steering column includes a housing opened in an axial direction of the steering column, a cover configured to close an opening of the housing, and a sealing member configured to provide sealing between the housing and the cover; a first side in the axial direction of the steering column is a side where the housing is located relative to the cover, and a second side in the axial direction of the steering column is a side where the cover is located relative to the housing; characterized in that the housing includes an inclined portion having an inclined surface with an inside diameter increasing from the first side to the second side, the inclined surface contacting the sealing member from the first side; the cover includes a facing portion having a facing surface contacting the sealing member from the second side, and an insertion portion having an outer peripheral surface contacting the sealing member from an inner peripheral side; the sealing member is accommodated in an accommodation space defined by the inclined surface, the facing surface, and the outer peripheral surface; and an escape space continuous with the accommodation space is provided between the housing and the cover, the escape space being located closer to the first side than the inclined surface is. the steering column includes a housing opened in an axial direction of the steering column, a cover configured to close an opening of the housing, and a sealing member configured to provide sealing between the housing and the cover; a housing opened in an axial direction of the steering column, a cover configured to close an opening of the housing, and a sealing member configured to provide sealing between the housing and the cover; a first side in the axial direction of the steering column is a side where the housing is located relative to the cover, and a second side in the axial direction of the steering column is a side where the cover is located relative to the housing; characterized in that the housing includes an inclined portion having an inclined surface with an inside diameter increasing from the first side to the second side, the inclined surface contacting the sealing member from the first side; the cover includes a facing portion having a facing surface contacting the sealing member from the second side, and an insertion portion having an outer peripheral surface contacting the sealing member from an inner peripheral side; the sealing member is accommodated in an accommodation space defined by the inclined surface, the facing surface, and the outer peripheral surface; and an escape space continuous with the accommodation space is provided between the housing and the cover, the escape space being located closer to the first side than the inclined surface is.