Gyeongbokgung is Seoul's grand main palace — the grounds are large and you'll walk a lot, so dragging a suitcase around isn't fun. Store your bags at Gyeongbokgung Station (Line 3) and tour hands-free.
Coin lockers at Gyeongbokgung Station
Gyeongbokgung Station has T-Locker coin lockers at 3 spots, about 88 in total. It's the station right at the palace, so you can store and walk straight in. See spots and how many are free now, by size, on the Gyeongbokgung Station page.
Prices are the same across Seoul — about ₩2,200 (small) to ₩4,400 (large) for four hours, then an hourly charge. English screen, card payment, no ID.
Before you visit
The palace is closed on Tuesdays, and entry is free if you wear hanbok (Korean traditional dress). A visit usually takes 1–2 hours, so it's easier with your big bag in a locker. Try to time it with the royal guard-changing ceremony.
When they're full
Check live availability on the station page first; if it's full, try nearby Anguk (Line 3) or Gwanghwamun (Line 5), or see the full Seoul luggage storage guide.
Sources: prices, sizes and hours from the Seoul Metropolitan Government (T-Locker); spots, counts and availability from Seoul Open Data. Check official palace info for opening hours.