A mobile phone/tablet case with finger grasping ring comprises a box for receiving a body of the mobile phone or tablet, a finger grasping ring is provided on the box bottom; the finger grasping ring is provided a multiple of finger holes which are enterable by fingers. Another embodiment the finger grasping ring has an elastic valve and an elastic belt; the elastic valve has one side connected with the elastic bottom together and other sides are separated from the bottom; the elastic belt has two opposite ends connected with the elastic valve together and other two opposite sides separated from the elastic valve, the elastic belt is parallel to long sides of the box. When the middle finger of user enter the gap between the belt and valve, the case with a mobile phone/tablet is grasped without thumb.