Heat exchanger and cooling tower

Provided are a cooling tower involving condensation and a heat exchanger used for the same which are capable of improving heat exchanging performance while reducing the amount of water to be used. The cooling tower is provided with: a heat exchanger which includes a plurality of parallel flow paths arranged at an inclination angle that enables a fluid for refrigeration to circulate in the gravity direction or that enables a condensed fluid to circulate by gravity utilization; a fan which performs perflation such that air passes through the heat exchanger; a spraying nozzle which sprays water drops in the form of fine particles to the heat exchanger; and a pipe which is connected to the heat exchanger.