noun-modifying (irregular)
with a built-in headboard unit
Describes a bed whose headboard incorporates shelves, drawers, or similar storage. The term comes from the resemblance to a Shinto shrine (宮) with attached structures. Used attributively, typically as 宮付きベッド.
See also: 宮 (みや)
A bed with a built-in headboard unit has lots of storage and is convenient.
Compound of 宮 (みや, 'shrine') + 付き (つき, 'attached'), from the resemblance of the headboard with shelves and drawers to a shrine with attached structures.