Slide rail device for a server rack

A slide rail device for connecting with a server case, the server case having an engaging member, comprising:

• a middle rail unit including a middle rail and a return abutting member which is disposed on said middle rail;
• and
• an inner rail unit including an inner rail which is disposed on and longitudinally slidable along said middle rail, a lock member which is disposed on said inner rail, and a releasing member which is disposed on said inner rail and movably connected with said lock member, said inner rail having an inner rail surface facing said middle rail, a first end, a second end longitudinally opposite to said first end, and an engaging slot formed therethrough for the engaging member to be transversely inserted thereinto, said lock member being engageable with the engaging member to prevent removal of the engaging member from said engaging slot, said releasing member being operably moved longitudinally toward said second end to abut and press said lock member away from said inner rail surface so as to release engagement of said lock member from the engaging member, wherein, during sliding movement of said inner rail unit relative to said middle rail in a retreating direction, said releasing member is moved to be in abutting engagement with and pressed by said return abutting member to return toward said first end to an original position thereof.