A keyboard device comprising: a plurality of keys; and action mechanisms respectively provided corresponding to the plurality of keys; wherein each of the action mechanisms includes: a transmission member configured to be displaced in response to a depression operation on a corresponding key of the plurality of keys; a transmission holding shaft configured to hold the transmission member; and a hammer member configured to provide an action load to the corresponding key subjected to the depression operation by being displaced in a direction in response to the displacement of the transmission member corresponding to the key subjected to the depression operation; wherein the transmission member includes a transmission body section (22, 45), a transmission fitting section formed at one end of the transmission body section (22, 45) and mounted on the transmission holding shaft; characterized in that transmission member further includes a barycenter position setting member (22b and 22c) formed on the transmission body section (22, 45); wherein the barycenter position setting member (22b and 22c) is configured to set a key touch feeling of the depression operation; the barycenter position setting member (22b and 22c) includes a plurality of first and second ribs (22b and 22c) integrally formed on the transmission body section (22, 45); the formation positions of the plurality of first ribs and second ribs are configured to set the barycenter position of the transmission member; the formation density of the plurality of first ribs and second ribs is configured to set the weight of the transmission member; and the formation density of the second ribs is finer than the formation density of the first ribs. a plurality of keys; and action mechanisms respectively provided corresponding to the plurality of keys; wherein each of the action mechanisms includes: a transmission member configured to be displaced in response to a depression operation on a corresponding key of the plurality of keys; a transmission holding shaft configured to hold the transmission member; and a hammer member configured to provide an action load to the corresponding key subjected to the depression operation by being displaced in a direction in response to the displacement of the transmission member corresponding to the key subjected to the depression operation; wherein the transmission member includes a transmission body section (22, 45), a transmission fitting section formed at one end of the transmission body section (22, 45) and mounted on the transmission holding shaft; characterized in that transmission member further includes a barycenter position setting member (22b and 22c) formed on the transmission body section (22, 45); wherein the barycenter position setting member (22b and 22c) is configured to set a key touch feeling of the depression operation; the barycenter position setting member (22b and 22c) includes a plurality of first and second ribs (22b and 22c) integrally formed on the transmission body section (22, 45); the formation positions of the plurality of first ribs and second ribs are configured to set the barycenter position of the transmission member; the formation density of the plurality of first ribs and second ribs is configured to set the weight of the transmission member; and the formation density of the second ribs is finer than the formation density of the first ribs. a transmission member configured to be displaced in response to a depression operation on a corresponding key of the plurality of keys; a transmission holding shaft configured to hold the transmission member; and a hammer member configured to provide an action load to the corresponding key subjected to the depression operation by being displaced in a direction in response to the displacement of the transmission member corresponding to the key subjected to the depression operation; wherein the transmission member includes a transmission body section (22, 45), a transmission fitting section formed at one end of the transmission body section (22, 45) and mounted on the transmission holding shaft; characterized in that transmission member further includes a barycenter position setting member (22b and 22c) formed on the transmission body section (22, 45); wherein the barycenter position setting member (22b and 22c) is configured to set a key touch feeling of the depression operation; the barycenter position setting member (22b and 22c) includes a plurality of first and second ribs (22b and 22c) integrally formed on the transmission body section (22, 45); the formation positions of the plurality of first ribs and second ribs are configured to set the barycenter position of the transmission member; the formation density of the plurality of first ribs and second ribs is configured to set the weight of the transmission member; and the formation density of the second ribs is finer than the formation density of the first ribs.