A yarn monitoring device (10, 110) that monitors a state of a yarn that travels in a traveling direction through a traveling space (R1, R2, R3) comprising: a housing; and a yarn monitoring unit (6, 106) arranged inside the housing, wherein the yarn monitoring unit (6, 106) includes a monitoring section (63, 64, 163) that monitors a state of the yarn that travels through the traveling space (R1, R2, R3); a yarn path guide (65, 165, 66, 166, 90) that guides the traveling yarn; and a holder (61, 62, 161) that houses the monitoring section (63, 64, 163) and the yarn path guide (65, 165, 66, 166), wherein the yarn path guide (65, 165, 66, 166) is arranged adjacent to the traveling space (R1, R2, R3), characterized in that the yarn path guide (65, 165, 66, 166) includes a charge eliminating member (65a, 165a, 66a, 166a, 92a) that eliminates an electric charge generated by the traveling of the yarn (y), the housing includes a connecting member (5, 51, 52, 151, 152) that is electrically connected to the charge eliminating member (65a, 165a, 66a, 166a, 92a), and an electrical resistivity of the charge eliminating member (65a, 165a, 66a, 166a, 92a) is higher than or equal to an electrical resistivity of the connecting member (5, 51, 52, 151, 152) wherein the connecting member (5, 51, 52, 151, 152) is electrically connected to a ground potential, and wherein the yarn monitoring device (10, 110) further comprises a first electrically conductive member (8, 107a, 153b, 153d) that is arranged in the housing; and a substrate (7, 107) that sends information acquired by the monitoring section (63, 64, 163) to the outside of the yarn monitoring device (10, 110), and is electrically connected to a ground potential, wherein the connecting member (5, 51, 52, 151, 152) is electrically connected to the substrate (7, 107) via the first electrically conductive member (8, 107a, 153b, 153d). a housing; and a yarn monitoring unit (6, 106) arranged inside the housing, wherein the yarn monitoring unit (6, 106) includes a monitoring section (63, 64, 163) that monitors a state of the yarn that travels through the traveling space (R1, R2, R3); a yarn path guide (65, 165, 66, 166, 90) that guides the traveling yarn; and a holder (61, 62, 161) that houses the monitoring section (63, 64, 163) and the yarn path guide (65, 165, 66, 166), wherein a monitoring section (63, 64, 163) that monitors a state of the yarn that travels through the traveling space (R1, R2, R3); a yarn path guide (65, 165, 66, 166, 90) that guides the traveling yarn; and a holder (61, 62, 161) that houses the monitoring section (63, 64, 163) and the yarn path guide (65, 165, 66, 166), wherein the yarn path guide (65, 165, 66, 166) is arranged adjacent to the traveling space (R1, R2, R3), characterized in that the yarn path guide (65, 165, 66, 166) includes a charge eliminating member (65a, 165a, 66a, 166a, 92a) that eliminates an electric charge generated by the traveling of the yarn (y), the housing includes a connecting member (5, 51, 52, 151, 152) that is electrically connected to the charge eliminating member (65a, 165a, 66a, 166a, 92a), and an electrical resistivity of the charge eliminating member (65a, 165a, 66a, 166a, 92a) is higher than or equal to an electrical resistivity of the connecting member (5, 51, 52, 151, 152) the housing includes a connecting member (5, 51, 52, 151, 152) that is electrically connected to the charge eliminating member (65a, 165a, 66a, 166a, 92a), and an electrical resistivity of the charge eliminating member (65a, 165a, 66a, 166a, 92a) is higher than or equal to an electrical resistivity of the connecting member (5, 51, 52, 151, 152) wherein the connecting member (5, 51, 52, 151, 152) is electrically connected to a ground potential, and wherein the yarn monitoring device (10, 110) further comprises a first electrically conductive member (8, 107a, 153b, 153d) that is arranged in the housing; and a substrate (7, 107) that sends information acquired by the monitoring section (63, 64, 163) to the outside of the yarn monitoring device (10, 110), and is electrically connected to a ground potential, wherein the connecting member (5, 51, 52, 151, 152) is electrically connected to the substrate (7, 107) via the first electrically conductive member (8, 107a, 153b, 153d). a first electrically conductive member (8, 107a, 153b, 153d) that is arranged in the housing; and a substrate (7, 107) that sends information acquired by the monitoring section (63, 64, 163) to the outside of the yarn monitoring device (10, 110), and is electrically connected to a ground potential, wherein the connecting member (5, 51, 52, 151, 152) is electrically connected to the substrate (7, 107) via the first electrically conductive member (8, 107a, 153b, 153d).