noun
world record holder
Refers to a person who currently holds a world record in any field, most commonly sports.
彼は100メートル走の世界記録保持者だ。
He is the world record holder in the 100-meter dash.
世界記録 means 'world record' (the record itself), while 世界記録保持者 refers to the person who holds it.
Compound of 世界 (world), 記録 (record), 保持 (holding/maintaining), and 者 (person).