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 includes: a supply device for supplying a medicinal agent of interest to a container capable of being filled with the medicinal agent a holding body having a plurality of holding sections, each of which can hold the container a conveyance device for conveying the holding body and moving the holding body to a supply position at which the medicinal agent can be supplied from the supply device to the container held by any one of the plurality of holding sections and a detecting unit for detecting the holding body located on an immediately upstream side of the supply position.
