Oscillating element

An oscillating element comprising:

• a substrate;
• a plurality of negative resistance elements that are electrically connected to the substrate;
• a plurality of antennas that transmit or receive an electromagnetic wave, each of the plurality of antennas having at least one of the plurality of negative resistance elements;
• a pad electrically connected to a power supply source for supplying power to the plurality of antennas;
• and
• a conductor that electrically connects the pad and the plurality of antennas to each other, wherein
• the conductor is constituted of a common wiring that is common to the plurality of antennas and individual wirings from the common wiring to each of the plurality of antennas, and
• wherein the individual wirings include at least two individual wirings that differ from each other with respect to at least one of a sectional area, resistivity, and a length in accordance with a position on the substrate of an antenna connected to each of the at least two individual wirings so as to reduce a difference in wiring resistances that is caused based on a distance between the antenna connected to each of the at least two individual wirings and the pad.