Type Ia supernova rate at z similar to 0.1

We present the EROS nearby supernova (z similar to 0.02-0.2) search and the analysis of the first year of data (1997). A total of 80 square degrees we re surveyed. Eight supernov ae were detected, four of which were spectrosco pically identified as type Ia supernov ae. The search efficiency was determ ined with a Monte-Carlo simulation taking into account the efficiencies for both supernova detection and host galaxy identification. Assuming that for a given galaxy the supernova rate is proportional to the galactic luminosi ty, we compute a type Ia supernova explosion rate of: R = 0.44(-0.21-0.07)( +0.35+0.13)h(2)/10(10) L.(B)/100 yrs at an average redshift of similar to 0 .1 where the errors are respectively statistical and systematic (type misid entification included).