The OP didn't have a source, or ID, alas. If it doesn't have a common name, "Golden Snitch" seems appropriate
EDIT:alopex tracked down the photo to the Japanese NatGeo site here
It's a Hybosorid scarabaeiform, or Scavenger Scarab. In particular it's the Brassy, or Golden-Green Pill Scarab Ceratocanthus aeneus, or a close relative.