Abstract: Replaceable blade type medical scissors are composed of scissor bodies and replaceable blades. Each of the replaceable blades is composed of a blade portion made of a metal plate which is bent such as to have an arcuate cross section and a retaining portion which is constructed by the metal plate bent into an envelope form which gradually increases in width towards the base portion. Each replaceable blade is adapted to allow plastic deformation and is integrally provided at the base portion of the blade portion. An insertion piece which is provided at the end portion of the scissor body is inserted into the retaining portion of the replaceable blade while the retaining portion is slightly expanded. The replaceable blade is removably secured to the scissor body by the elastic contracting force of the retaining portion.