Hello and welcome to the UK PD Forum, I am not French but maybe there are some French people here I don't know but if there are I am sure they will make themselves know to you.
I went searching for info for you and came up with
EPDA member organisation in France Association France Parkinson
4, Avenue du Colonel Bonnet
telephone +33 (0)1 45 20 22 20 +33 (0)1 45 20 22 20
facsimile +33 (0)1 40 50 16 44
Perhaps you already know of this site.....if not maybe you could have a look on their web site.
All the best to you, take care