A hard disk data interface pitch converter is disclosed, which comprises: a converting part, comprising converting terminals and contact terminals, the converting terminals comprising metallic conductors having a relatively large interval at one end and a relatively small interval at the other end; a short connection part for connecting any two or more non-adjacent metallic conductors in the contact terminals through metallic conductors; a base with a channel for accommodating the contact terminals and a slot for fixing the short connection part; a cover body cooperating with the base for protecting the converting part and short connection part. An extension part is formed by digging each metallic conductor in the contact terminals, and exactly shields a gap between the contact terminals and channel. The short connection part enables miniaturization of a device. It is possible to prevent adhesives or foreign objects from falling onto contacting ends of the contact terminals.