1. A work head unit comprising:a component holding section configured to hold a component and be rotatable around a rotational axis, the component holding section including a syringe member and a collecting member configured to collect the component and to be attached to and removed from the syringe member; and
a rotary section holding the component holding section;
a detection section extending along and facing the syringe member and the collecting member and configured to detect the orientation of the component holding section, wherein
the detection section includes a first optical type or magnetic type encoder positioned below the rotary section and configured to detect a rotational position of the collecting member, and
the detection section includes a second optical type or magnetic type encoder positioned above the rotary section and configured to detect a rotational position of the syringe.