Solid preparation administering instrument

A device for subcutaneously administering solid or semisolid preparations to the human body, comprising a hollow cylindrical member having a stepped hole which is longitudinal to the cylindrical member of which the front portion that is positioned at the proximal end of the cylindrical member has a diameter smaller than that of the rear portion which is positioned at the distal end of the cylindrical member to form a capsule loading chamber, a plunger slidably mounted in said cylindrical member, and a hollow needle member removably mounted on the proximal end of said cylindrical member, said cylindrical member being provided at its proximal end with an oblong opening for attachment of said needle member and for loading of one or more capsules containing solid or semisolid preparations, said oblong opening being communicated with said chamber through a disk-like hole formed therebetween, said hollow needle member having an inside diameter smaller than the outside diameter of the capsule to form a stopper for a capsule and being provided at its rear end with a fixing member having an oblong flange insertable in the disk like hole through said oblong opening.