A wearable electrode for detecting a bioelectric signal of a wearer of a garment, comprising: one or more first electrodes fixed to the garment such that the one or more first electrodes can simultaneously come in contact with skin of parts from a ventral side to a dorsal side of an upper left part of a body of the wearer; and one or more second electrodes fixed to the garment such that the one or more second electrodes can simultaneously come in contact with skin of parts from a ventral side to a dorsal side of an upper right part of the body of the wearer, characterized in that each of the one or more first electrodes and the one or more second electrodes includes a ventral-side distal end and a dorsal-side distal end and is installed gradually descending from the ventral-side distal end to the dorsal-side distal end with the wearer standing upright, wherein the one or more first electrodes are fixed to the garment such that the one or more first electrodes can simultaneously come in contact with skin of a left breast of the wearer, skin of at least one of a left side chest, a left hypochondriac region, and a left armpit of the wearer, and skin of at least one of the dorsal side of the left side chest, the dorsal side of the left hypochondriac region, and a lower portion of a left scapular region of the wearer, and the one or more second electrodes are fixed to the garment such that the one or more second electrodes can simultaneously come in contact with skin of a right breast of the wearer, skin of at least one of a right side chest, a right hypochondriac region, and a right armpit of the wearer, and skin of at least one of the dorsal side of the right side chest, the dorsal side of the right hypochondriac region of the wearer, and a lower portion of a right scapular region. one or more first electrodes fixed to the garment such that the one or more first electrodes can simultaneously come in contact with skin of parts from a ventral side to a dorsal side of an upper left part of a body of the wearer; and one or more second electrodes fixed to the garment such that the one or more second electrodes can simultaneously come in contact with skin of parts from a ventral side to a dorsal side of an upper right part of the body of the wearer, characterized in that each of the one or more first electrodes and the one or more second electrodes includes a ventral-side distal end and a dorsal-side distal end and is installed gradually descending from the ventral-side distal end to the dorsal-side distal end with the wearer standing upright, wherein the one or more first electrodes are fixed to the garment such that the one or more first electrodes can simultaneously come in contact with skin of a left breast of the wearer, skin of at least one of a left side chest, a left hypochondriac region, and a left armpit of the wearer, and skin of at least one of the dorsal side of the left side chest, the dorsal side of the left hypochondriac region, and a lower portion of a left scapular region of the wearer, and the one or more second electrodes are fixed to the garment such that the one or more second electrodes can simultaneously come in contact with skin of a right breast of the wearer, skin of at least one of a right side chest, a right hypochondriac region, and a right armpit of the wearer, and skin of at least one of the dorsal side of the right side chest, the dorsal side of the right hypochondriac region of the wearer, and a lower portion of a right scapular region.