<p>A tubular body 1 has an injection needle at one end 1a and a plunger 2 at the other end, and a partition 3 slidable axially in the tubular body. The partition includes a front part 3a and a rear part 3b independent of each other, and as a whole dividing the interior space of the tubular body into a front compartment 4 and a rear compartment 5 in a sealing manner for storing dry powder P and liquid L, respectively. A bypass 6 is disposed between the compartments 4 and 5 to introduce the liquid L in the rear compartment 5 into the front compartment 4 when the partition 3 is slid under pressure provided by the plunger 2 to be adjacent to the bypass 6 whereby the substances are mixed immediately prior to injection. The liquid L can be introduced first and sterilised before the dry powder is placed in the front compartment 4. The front part 3a serves as a seal to prevent contamination of the powder with moisture. <IMAGE></p>
