A sperm collecting apparatus is provided and includes a container including a cylindrical container main unit that has an opening portion on at least one end face in a longitudinal direction thereof and a cap that is attached to and detached from the opening portion of the container main unit to close and open the opening portion, and a core member which is accommodated in said container and has an insertion room extending from an insertion port at one end face in a longitudinal direction therein. The core member includes a core main unit having said insertion port and the insertion room and a plurality of ribs provided upright from an outer face of the core main unit to cross one another, and sealed rooms are formed through the outer face of the core main unit.