Masashi Noda

Haruo (known as Masashi Noda in the 1979 anime) is one of Nobita's classmates who often appears with Yasuo. He is moderately fat but is smaller than Gian. Much like Yasuo, he appears fairly often as a representative of Nobita's friends. He is often credited in the movies as Boy B (少年B).

(Source: Doraemon Wiki)