From Wikipedia:
Junko Hori (堀 絢子 Hori Junko, born February 2, 1942 in Tokyo, Japan) is a Japanese actress and voice actress represented by Production Baobab.
She is known as the voice of the protagonists in 3 Fujiko Fujio works, Obake no Q-tarō, Ninja Hattori-kun, and Chimpui. As a dub artist she is known for the roles of Jerry (1969-1970) from Tom and Jerry and Bart Simpson from The Simpsons.