When Balochistan state became a part of the West Pakistan?

When Balochistan state became a part of the West Pakistan?

ریاست بلوچستان کب مغربی پاکستان کا حصہ بنی؟
Explanation

In 1955, Balochistan was merged into one unit of West Pakistan.

After the dissolution of one-Unit, Balochistan emerged as one of the four new provinces of Pakistan.