There is provided a medicinal agent filling device that allows reduction of the operators time and effort when the operator fills a medicinal agent into a container. A medicinal agent filling device (1) includes: a supply device (10) for supplying a medicinal agent of interest to a container (26) capable of being filled with the medicinal agent a holding body (20) having a plurality of holding sections, each of which can hold the container (26) a conveyance device (30) for conveying the holding body (20) and moving the holding body (20) to a supply position at which the medicinal agent can be supplied from the supply device (10) to the container (26) held by any one of the plurality of holding sections and a detecting unit for detecting the holding body (20) located on an immediately upstream side of the supply position.
