[Author] O. I. Reinov [Title] Approximation of operators in Banach spaces [AMS Subj-class] 46B28 Spaces of operators; tensor products; approximation properties [Abstract] It is a translation of an old paper of the author. We describe the topology $\tau_p$ in the space $\Pi_p(Y,X),$ for which the closures of convex sets in $\tau_p$ and in ${}^*$-weak topology of the space $\Pi_p(Y,X)$ are coincident. Thereafter, we investigate some properties of the space $\Pi_p,$ related to this new topology. 2010-remark: Occasionally, the topology is coincides with the $\lambda_p$-topology from the paper "Compact operators which factor through subspaces of $l_p$", Math. Nachr. 281(2008), 412-423, by Deba Prasad Sinha and Anil Kumar Karn. [Comments] AMSTeX, English, 10 pp. Just a translation of an old paper of the author ("Approximation of operators in Banach spaces", in the collection "Primenenie funkcional'nogo analiza v teorii priblizhenij" (1985), 128-142), with nonessential changes and remarks. Two aims: the paper is difficult to get even in Russian, and it is to apply its main results in a next preprint to answer an open question posed in a Math. Nachr. paper of 2008. [Contact e-mail] orein51@mail.ru