The official creator credit for Batman goes contractually to Bob Kane. I don't know anyone outside Kane's family who doesn't think a man named Bill Finger is as deserving, if not more so, of that recognition.
Finger died in 1974. Some years later, Kane wrote that he wished he'd put his former collaborator's name on the feature but that never happened. Kane died in 1998 and since then, Kane has continued to be credited as sole creator and his reputation has plunged. It seems to me he's now more often mentioned as a guy who screwed over his partner than as a guy who gave the world one of its great fantasy characters.
Last Comic-Con, I had the pleasure to meet and appear with Athena Finger, the granddaughter of Bill Finger. She's fighting for her grandpa's honor, assisted by many of us. Here's an article about her and that fight.