It's a 'headboard' - but in your photo it looks like it's only one half of the headboard...🤔

It could also be a footboard depending on which end of the bed it goes on. Some beds don't have these. Some have only a headboard while some have both. Cheers

I agree with Charlie. A "Headboard."

'cabecero' en español. ;-) Sí, parece medio, jejeje.

WHAT is this thing called. Headboard or footboard, depending on which end of the bed it's on.