Detection sensor and detection device including the same

A detection sensor comprising:

• a vibratable film constituted by a piezoelectric film, the vibratable film being configured to be irradiated with infrared rays and thereby generate first electric signals through a pyroelectric effect, and configured to be vibrated by sound waves and thereby generate second electric signals through a piezoelectric effect;
• a case accommodating the vibratable film and including:
• a top plate disposed on one side in a first direction relative to the vibratable film, the first direction being a thickness direction of the vibratable film, and
• a sound hole in the top plate to input sound waves through the sound hole;
• and
• a circuit board being fixed to the case, being disposed on the other side in the first direction relative to the vibratable film, and including a transmissive part, the transmissive part being configured to transmit at least infrared rays and disposed on the other side in the first direction relative to the vibratable film to face the vibratable film, wherein
• in a cross section along a second direction substantially orthogonal to the first direction, the sound hole has dimensions that are smaller than the dimensions of the transmissive part.