A biological information detection device has a device main body and a biological signal detection portion formed integrally with the device main body. The biological signal detection portion has at least one electrode for contacting a biological surface of a human body. A fixing portion has an elastic strap and is configured to mount the device main body and the biological signal detection portion to the human body without the device main body and the biological signal detection portion being directly attached to the elastic strap. The fixing portion covers the device main body and the biological signal detection portion with the electrode being disposed in contact with the biological surface of the human body when the device main body and the biological signal detection portion are mounted to the human body.
