A razor blade cartridge is detachably attached to a holder. A socket portion is provided to the holder. A coupler projection, which detachably attaches to the socket portion through the insertion/ejection opening of the socket portion, is provided to the blade cartridge. A guide portion, which extends towards the opposite side from the skin contacting surface of the blade cartridge and is supported by the socket portion of the holder, is provided to the coupler projection of the blade cartridge. The end of the guide portion is provided with a manipulation portion, which is manipulated at the manipulation opening of the socket portion to release the guide portion from the socket portion and the manipulation of which removes the blade cartridge from the insertion/ejection opening of the socket portion. Thus, the blade cartridge can be easily removed by a gentle application of pressure on the manipulation portion.