Note: the photo is marked: © G. Bulté (The tandem co-winner of PBP 1956 was Gilbert BULTÉ.)
(Later...) I think this is Gilbert BULTÉ himself, and not from PBP 1956.
Photo source: Web pages removed. Was here in 2003. From an article titled: "L' Esprit du Paris-Brest-Paris"
PBP Photos - 1956