The firms said on Wednesday that they'll explore a tie-up in the fields of environment-friendly, self-driving autos, safety and vehicle information technology.

They say they hope their collaboration will help them strengthen international competitiveness.

Toyota's President Akio Toyoda and Suzuki's Chairman Osamu Suzuki plan to hold a joint news conference later on Wednesday to explain their partnership talks.

Auto industry sources say Suzuki has sought a partner as huge funding is necessary to develop cutting-edge technology. Toyota faces the challenge of spreading its advanced technology among other automakers as part of the industry's realignment.

Toyota has large market shares both in Japan and abroad. Suzuki is strong in sales in emerging economies such as India and the domestic market for mini vehicles.

Industry sources say a partnership between the 2 firms would affect strategies of Japanese and foreign rivals.