Abstract: Disclosed is a card type electrocardio measuring device, including: a circuit board (101), a main body bracket (102) and a back encapsulation; the circuit board (101) is arranged on the front of the main body bracket (102); the back encapsulation is arranged on the back of the main body bracket (102); the main body bracket (102) has a hollow shape, and electronic components on the circuit board (101) are respectively accommodated fitly between the back of the circuit board (101) and the back encapsulation, in a way of penetrating a hollow portion of the main body bracket (102).