A medical kit (100) includes a liquid storage container (5) in which a liquid (P) is preliminarily stored, syringes (1a) and (1b), a first connector (3) for connecting the liquid storage container (5) and the syringes (1a) and (1b), and a regulating mechanism (30) for collectively regulating limits of movement of gaskets (7) of the syringes (1a) and (1b). The syringes (1a) and (1b) are collectively filled with the liquid (P) by conducting an operation to feed out the liquid (P) in the liquid storage container (5) in a condition in which the liquid storage container (5) and the syringes (1a) and (1b) in an empty state are connected through the syringes (1a) and (1b), until the limits of movement are regulated.
