Device for continuous biometric recognition of a user based on electrocardiographic signals of the user, comprising a sensory unit that includes an electronic module of measurement terminals, an electronic module of transduction and signal conditioning with virtual ground, an electronic module for analog-to-digital conversion, and an electronic module for signal transmission, and a computational unit, wherein: a) the electronic module of measurement terminals comprises capacitive sensors for the measurement of the electromagnetic field or non-metallic conductive elements for the measurement of the electrical potential differential; b) it includes a virtual reference in the electronic module of transduction and signal conditioning; c) the electronic module of transduction and signal conditioning with virtual ground, includes an electromagnetic noise filter; d) the computational unit includes a method for customization of its settings and/or for granting or rejecting access of the user to the device, according to the result of the biometric recognition of the user wherein the device is configured to continuously verify identity of the user by uninterrupted biometric recognition of the user while the device is being used by the user; wherein the electronic module of measurement terminals from the sensory unit comprises only two measurement terminals configured to be in direct contact with the user; wherein the electromagnetic noise filter of the electronic module of transduction and signal conditioning with virtual ground has a passing band between 0.5 and 40 Hz, and the electronic module of transduction and signal conditioning with virtual ground is free of notch filters; wherein the electronic module for analog-to-digital conversion has a sampling rate of between 250 Hz and 4 kHz. a) the electronic module of measurement terminals comprises capacitive sensors for the measurement of the electromagnetic field or non-metallic conductive elements for the measurement of the electrical potential differential; b) it includes a virtual reference in the electronic module of transduction and signal conditioning; c) the electronic module of transduction and signal conditioning with virtual ground, includes an electromagnetic noise filter; d) the computational unit includes a method for customization of its settings and/or for granting or rejecting access of the user to the device, according to the result of the biometric recognition of the user wherein the device is configured to continuously verify identity of the user by uninterrupted biometric recognition of the user while the device is being used by the user; wherein the electronic module of measurement terminals from the sensory unit comprises only two measurement terminals configured to be in direct contact with the user; wherein the electromagnetic noise filter of the electronic module of transduction and signal conditioning with virtual ground has a passing band between 0.5 and 40 Hz, and the electronic module of transduction and signal conditioning with virtual ground is free of notch filters; wherein the electronic module for analog-to-digital conversion has a sampling rate of between 250 Hz and 4 kHz.